Final Project

Author

SMukrabine

Research Question: What factors increase the likelihood that an email is classified as spam?

Introduction

Sending spam emails is a common problem in digital communication. If what makes an email more likely to be classified as spam is understood, then it can help improve filtering and security in online networks. This study is based on the question: What factors increase the likelihood that an email is classified as spam? Based on statistical modeling of real email data, I try to identify what kinds of features messages have in this case, depending on their roles in spam: line breaks, exclamation marks, and trigger words. This topic matters because spam filters are applied by everyday users, and analysis on real data can be useful to find patterns automatically used by filters.

In this study, we use the dataset available in the OpenIntro package with 3,921 email observations and 21 attributes representing the different features of each message. The dataset contains individual email records received between January and March 2012 from the Gmail account of David Diez, with all personal information removed. Key variables are whether the email was spam, how many line breaks (line_breaks), how many exclamation marks (exclaim_mess), and whether the email contained any words such as “winner” or “inherit.” Other variables involve formatting, attachments, subject line characteristics, and numeric content. I chose this topic because it’s an example of a real world problem and logistic regression is a helpful way of trying to classify which features tend to make the text spam prone. But the best thing I can glean from this analysis is to actually find patterns that differentiate spam from normal email.

Data Analysis

Before analyzing the email dataset, I first loaded the data and cleaned the variable names so they were simpler to work with. With functions such as gsub() and tolower(), I removed special characters, replaced spaces with underscores, and made all names lowercase. These all help prevent mistakes from occurring in R and hence, the dataset will be much more uniform. In this step, I also checked the format of my data. After cleaning the names, I checked the structure of the data to check not only whether the variable is there but also, importantly, if it has any missing values.

Then, I used various dplyr functions (such as group_by(), summarize(), mutate() and much more) to prepare the data for a Logistic Regression Model to run. I aggregated the dataset by the outcome variable spam then calculated summary statistics about main predictors (mean line breaks, maximum exclamation marks, percentage of the emails which contain “winner” or “inherit,” average number). For calculation of these values, na.rm = TRUE was used for taking care of missing data by eliminating incomplete cases from the calculations. This was essential in figuring out why the predictor variables vary between spam & non-spam emails and got the dataset ready for modeling.

Load packages

library(tidyverse)
── Attaching core tidyverse packages ──────────────────────── tidyverse 2.0.0 ──
✔ dplyr     1.1.4     ✔ readr     2.1.5
✔ forcats   1.0.0     ✔ stringr   1.5.1
✔ ggplot2   3.5.2     ✔ tibble    3.3.0
✔ lubridate 1.9.4     ✔ tidyr     1.3.1
✔ purrr     1.1.0     
── Conflicts ────────────────────────────────────────── tidyverse_conflicts() ──
✖ dplyr::filter() masks stats::filter()
✖ dplyr::lag()    masks stats::lag()
ℹ Use the conflicted package (<http://conflicted.r-lib.org/>) to force all conflicts to become errors
library(dplyr)
library(pROC)
Warning: package 'pROC' was built under R version 4.5.2
Type 'citation("pROC")' for a citation.

Attaching package: 'pROC'

The following objects are masked from 'package:stats':

    cov, smooth, var

Load dataset

setwd("C:/Users/sajut/OneDrive/Desktop/DATA_101")

email <- read_csv("email.csv")
Rows: 3921 Columns: 21
── Column specification ────────────────────────────────────────────────────────
Delimiter: ","
chr   (2): winner, number
dbl  (18): spam, to_multiple, from, cc, sent_email, image, attach, dollar, i...
dttm  (1): time

ℹ Use `spec()` to retrieve the full column specification for this data.
ℹ Specify the column types or set `show_col_types = FALSE` to quiet this message.

Quick inspect

head(email)
# A tibble: 6 × 21
   spam to_multiple  from    cc sent_email time                image attach
  <dbl>       <dbl> <dbl> <dbl>      <dbl> <dttm>              <dbl>  <dbl>
1     0           0     1     0          0 2012-01-01 06:16:41     0      0
2     0           0     1     0          0 2012-01-01 07:03:59     0      0
3     0           0     1     0          0 2012-01-01 16:00:32     0      0
4     0           0     1     0          0 2012-01-01 09:09:49     0      0
5     0           0     1     0          0 2012-01-01 10:00:01     0      0
6     0           0     1     0          0 2012-01-01 10:04:46     0      0
# ℹ 13 more variables: dollar <dbl>, winner <chr>, inherit <dbl>, viagra <dbl>,
#   password <dbl>, num_char <dbl>, line_breaks <dbl>, format <dbl>,
#   re_subj <dbl>, exclaim_subj <dbl>, urgent_subj <dbl>, exclaim_mess <dbl>,
#   number <chr>
str(email)
spc_tbl_ [3,921 × 21] (S3: spec_tbl_df/tbl_df/tbl/data.frame)
 $ spam        : num [1:3921] 0 0 0 0 0 0 0 0 0 0 ...
 $ to_multiple : num [1:3921] 0 0 0 0 0 0 1 1 0 0 ...
 $ from        : num [1:3921] 1 1 1 1 1 1 1 1 1 1 ...
 $ cc          : num [1:3921] 0 0 0 0 0 0 0 1 0 0 ...
 $ sent_email  : num [1:3921] 0 0 0 0 0 0 1 1 0 0 ...
 $ time        : POSIXct[1:3921], format: "2012-01-01 06:16:41" "2012-01-01 07:03:59" ...
 $ image       : num [1:3921] 0 0 0 0 0 0 0 1 0 0 ...
 $ attach      : num [1:3921] 0 0 0 0 0 0 0 1 0 0 ...
 $ dollar      : num [1:3921] 0 0 4 0 0 0 0 0 0 0 ...
 $ winner      : chr [1:3921] "no" "no" "no" "no" ...
 $ inherit     : num [1:3921] 0 0 1 0 0 0 0 0 0 0 ...
 $ viagra      : num [1:3921] 0 0 0 0 0 0 0 0 0 0 ...
 $ password    : num [1:3921] 0 0 0 0 2 2 0 0 0 0 ...
 $ num_char    : num [1:3921] 11.37 10.5 7.77 13.26 1.23 ...
 $ line_breaks : num [1:3921] 202 202 192 255 29 25 193 237 69 68 ...
 $ format      : num [1:3921] 1 1 1 1 0 0 1 1 0 1 ...
 $ re_subj     : num [1:3921] 0 0 0 0 0 0 0 0 0 0 ...
 $ exclaim_subj: num [1:3921] 0 0 0 0 0 0 0 0 0 0 ...
 $ urgent_subj : num [1:3921] 0 0 0 0 0 0 0 0 0 0 ...
 $ exclaim_mess: num [1:3921] 0 1 6 48 1 1 1 18 1 0 ...
 $ number      : chr [1:3921] "big" "small" "small" "small" ...
 - attr(*, "spec")=
  .. cols(
  ..   spam = col_double(),
  ..   to_multiple = col_double(),
  ..   from = col_double(),
  ..   cc = col_double(),
  ..   sent_email = col_double(),
  ..   time = col_datetime(format = ""),
  ..   image = col_double(),
  ..   attach = col_double(),
  ..   dollar = col_double(),
  ..   winner = col_character(),
  ..   inherit = col_double(),
  ..   viagra = col_double(),
  ..   password = col_double(),
  ..   num_char = col_double(),
  ..   line_breaks = col_double(),
  ..   format = col_double(),
  ..   re_subj = col_double(),
  ..   exclaim_subj = col_double(),
  ..   urgent_subj = col_double(),
  ..   exclaim_mess = col_double(),
  ..   number = col_character()
  .. )
 - attr(*, "problems")=<externalptr> 

Clean variable names

names(email) <- gsub("[(). \\-]", "_", names(email)) 
names(email) <- gsub("_$", "", names(email))  
names(email) <- tolower(names(email))         

head(email) 
# A tibble: 6 × 21
   spam to_multiple  from    cc sent_email time                image attach
  <dbl>       <dbl> <dbl> <dbl>      <dbl> <dttm>              <dbl>  <dbl>
1     0           0     1     0          0 2012-01-01 06:16:41     0      0
2     0           0     1     0          0 2012-01-01 07:03:59     0      0
3     0           0     1     0          0 2012-01-01 16:00:32     0      0
4     0           0     1     0          0 2012-01-01 09:09:49     0      0
5     0           0     1     0          0 2012-01-01 10:00:01     0      0
6     0           0     1     0          0 2012-01-01 10:04:46     0      0
# ℹ 13 more variables: dollar <dbl>, winner <chr>, inherit <dbl>, viagra <dbl>,
#   password <dbl>, num_char <dbl>, line_breaks <dbl>, format <dbl>,
#   re_subj <dbl>, exclaim_subj <dbl>, urgent_subj <dbl>, exclaim_mess <dbl>,
#   number <chr>

Select variables, handle missing values, and convert types

email |> 
  group_by(spam) |> 
  summarize(
    n = n(),
    mean_line_breaks = mean(line_breaks, na.rm = TRUE),
    max_exclaim_mess = max(exclaim_mess, na.rm = TRUE),
    percent_winner = sum(winner == 1, na.rm = TRUE) / n(),
    percent_inherit = sum(inherit == 1, na.rm = TRUE) / n(),
    mean_number = mean(number, na.rm = TRUE)
  )
Warning: There were 2 warnings in `summarize()`.
The first warning was:
ℹ In argument: `mean_number = mean(number, na.rm = TRUE)`.
ℹ In group 1: `spam = 0`.
Caused by warning in `mean.default()`:
! argument is not numeric or logical: returning NA
ℹ Run `dplyr::last_dplyr_warnings()` to see the 1 remaining warning.
# A tibble: 2 × 7
   spam     n mean_line_breaks max_exclaim_mess percent_winner percent_inherit
  <dbl> <int>            <dbl>            <dbl>          <dbl>           <dbl>
1     0  3554             244.             1236              0          0.0307
2     1   367             105.             1209              0          0.0354
# ℹ 1 more variable: mean_number <dbl>

To know the number of NA(s) in my dataset use

sum(is.na(email))
[1] 0

Before analyzing the variable “winner,” I converted it into a factor and checked for missing values to make sure that it was ready for analysis. I also examined the output from xtabs() to see how it relates to spam emails. Most of the emails (3510) did not contain “winner” and were not spam, while only 44 non-spam ones contained this word. Of spam emails, 347 did not contain “winner,” but 20 did. “winner” is infrequently used; it is present more often in spam emails than in legitimate ones. This indicates that an email containing this term is more likely to be classified as spam. Hence, it supports the use of “winner” as a predictor in the logistic regression model.

#email$winner <- ifelse(email$winner == 1, "yes", "no")

Convert to a factor

email$winner <- as.factor(email$winner)
email[is.na(email$winner) | is.na(email$winner),]
# A tibble: 0 × 21
# ℹ 21 variables: spam <dbl>, to_multiple <dbl>, from <dbl>, cc <dbl>,
#   sent_email <dbl>, time <dttm>, image <dbl>, attach <dbl>, dollar <dbl>,
#   winner <fct>, inherit <dbl>, viagra <dbl>, password <dbl>, num_char <dbl>,
#   line_breaks <dbl>, format <dbl>, re_subj <dbl>, exclaim_subj <dbl>,
#   urgent_subj <dbl>, exclaim_mess <dbl>, number <chr>
xtabs(~ spam + winner, data=email)
    winner
spam   no  yes
   0 3510   44
   1  347   20

Statistical Analysis

To address the research question: “which features are associated with a higher probability that the email will be classified as spam”, I carried out a logistic regression model. Logistic regression, of course, was appropriate because the dependent variable, spam, is binary (0 = not spam, 1 = spam). This method gives a rough estimate of how things like line_breaks, exclaim_mess, winner, inherit, and number impact the log-odds of an email being spam. I first made a two-level factor for the winner variable so that the model could properly treat it as a categorical variable. The final model was then fitted using glm(family = binomial), and then I took the model summary, pseudo R-squared, and the direction and significance of the coefficients to get into how each variable contributes to predicting spam. The coefficients were interpreted in terms of log-odds, which helps decide if each element makes the probability the email is spam or not.

To assess the performance of my model, I developed a few diagnostics frequently used for logistic regression. Using generated probabilities, I fitted classes to a 0.5 threshold and made a confusion matrix for accuracy, sensitivity, and specificity evaluation. And then I created a ROC curve and made AUC value to track how well the model picked out spam vs non-spam emails. The curve of ROC gives a visualization of the trade-off of true positive and false positive rates, while the AUC represents a single metric of the overall performance. These diagnostic checks make sense, as they confirm whether the logistic model is good enough and how well it can predict spam.

Logistic Regression Model

logistic <- glm(spam ~ line_breaks + exclaim_mess + winner + inherit + number, data = email, 
                family = binomial)

summary(logistic)

Call:
glm(formula = spam ~ line_breaks + exclaim_mess + winner + inherit + 
    number, family = binomial, data = email)

Coefficients:
               Estimate Std. Error z value Pr(>|z|)    
(Intercept)  -1.6300104  0.1762815  -9.247  < 2e-16 ***
line_breaks  -0.0036025  0.0005126  -7.027 2.10e-12 ***
exclaim_mess  0.0107952  0.0016937   6.374 1.84e-10 ***
winneryes     2.0462322  0.3111301   6.577 4.81e-11 ***
inherit       0.3892669  0.1513819   2.571 0.010128 *  
numbernone    0.7266518  0.1955145   3.717 0.000202 ***
numbersmall  -0.6552543  0.1766146  -3.710 0.000207 ***
---
Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1

(Dispersion parameter for binomial family taken to be 1)

    Null deviance: 2437.2  on 3920  degrees of freedom
Residual deviance: 2136.0  on 3914  degrees of freedom
AIC: 2150

Number of Fisher Scoring iterations: 7
r_square <- 1 - (logistic$deviance / logistic$null.deviance)
r_square
[1] 0.1235933

Interpretation

The logistic regression model shows that all the variables line_breaks, exclaim_mess, winner, inherit, and number those are help to predict whether an email is spam. Emails with more line breaks are slightly less likely to be spam, while emails with more exclamation marks are more likely to be spam. The strongest effect comes from the word “winner,” which greatly increases the chance that an email is spam. Emails that mention “inherit” also have a higher chance of being spam. For the number variable, emails with no numbers are more spam like, while emails with small numbers are less likely to be spam. The pseudo R-squared value is 0.1236, meaning the model explains about 12% of the difference between spam and non spam emails. Even though this number is not very high, it is normal for spam data and shows that the predictors still provide useful information.

model_data <- logistic$model

predicted.data <- data.frame(
  probability.of.spam = logistic$fitted.values,
  spam = model_data$spam
)

predicted.data
     probability.of.spam spam
1           8.645456e-02    0
2           4.732779e-02    0
3           7.426794e-02    0
4           6.382059e-02    0
5           2.695246e-01    0
6           2.723711e-01    0
7           8.992946e-02    0
8           4.998560e-02    0
9           7.425858e-02    0
10          7.376564e-02    0
11          8.676922e-02    0
12          7.181974e-02    0
13          8.963606e-02    0
14          3.069155e-02    0
15          5.865413e-02    0
16          1.964461e-02    0
17          3.515430e-02    0
18          4.327977e-02    0
19          8.451255e-02    0
20          2.434387e-01    0
21          1.296748e-01    0
22          5.593063e-02    0
23          1.378524e-02    0
24          8.937504e-02    0
25          2.401366e-01    0
26          8.042535e-02    0
27          7.134093e-02    0
28          7.475541e-02    0
29          2.752387e-01    0
30          8.042172e-02    0
31          2.759579e-01    0
32          6.761529e-02    0
33          6.299910e-02    0
34          2.513007e-02    0
35          8.367918e-02    0
36          8.578919e-03    0
37          1.495563e-01    0
38          5.407964e-02    0
39          7.728563e-02    0
40          6.215310e-02    0
41          3.928933e-02    0
42          8.042354e-02    0
43          3.968973e-02    0
44          3.795189e-02    0
45          8.966867e-02    0
46          1.647457e-03    0
47          5.120573e-02    0
48          2.709479e-01    0
49          5.749366e-02    0
50          3.384272e-02    0
51          3.100658e-02    0
52          2.810224e-01    0
53          2.862180e-02    0
54          5.226551e-02    0
55          3.455418e-02    0
56          8.849935e-02    0
57          8.504249e-02    0
58          2.610987e-01    0
59          7.426794e-02    0
60          8.820917e-02    0
61          5.353069e-02    0
62          6.738930e-02    0
63          1.594211e-02    0
64          4.699573e-02    0
65          2.469047e-02    0
66          8.313118e-02    0
67          8.676922e-02    0
68          8.908228e-02    0
69          7.376228e-02    0
70          3.779957e-02    0
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96          8.149846e-02    0
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3699        2.688135e-01    0
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3704        5.907064e-02    0
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3709        2.745133e-01    0
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3711        3.430179e-02    0
3712        5.334039e-02    0
3713        8.849836e-02    0
3714        3.005679e-02    0
3715        7.980483e-02    0
3716        4.897653e-02    0
3717        6.992291e-02    0
3718        7.386409e-03    0
3719        2.759579e-01    0
3720        7.884210e-02    0
3721        6.693635e-02    0
3722        4.699573e-02    0
3723        1.040476e-02    0
3724        7.858086e-02    0
3725        2.434117e-02    0
3726        4.981713e-02    0
3727        2.610964e-01    0
3728        7.273553e-02    0
3729        7.254436e-02    0
3730        6.876053e-02    0
3731        2.738038e-01    0
3732        6.761606e-02    0
3733        7.910413e-02    0
3734        8.937304e-02    0
3735        8.763141e-02    0
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3738        8.937304e-02    0
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3740        8.937304e-02    0
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3744        8.763141e-02    0
3745        8.937304e-02    0
3746        4.095494e-02    0
3747        7.109532e-02    0
3748        7.015755e-02    0
3749        2.456268e-03    0
3750        2.652927e-01    0
3751        1.909949e-02    0
3752        8.395865e-02    0
3753        5.208856e-02    0
3754        1.330396e-02    0
3755        3.969884e-02    0
3756        1.413231e-02    0
3757        8.042626e-02    0
3758        7.134174e-02    0
3759        1.051221e-01    0
3760        4.863805e-02    0
3761        4.964804e-02    0
3762        1.252637e-01    0
3763        6.648319e-02    0
3764        1.025930e-02    0
3765        6.049004e-02    0
3766        6.999726e-03    0
3767        5.867620e-02    0
3768        4.781803e-02    0
3769        4.814152e-02    0
3770        7.230070e-02    0
3771        3.665911e-02    0
3772        9.152462e-03    0
3773        2.097535e-06    0
3774        7.990871e-03    0
3775        6.807171e-02    0
3776        2.709455e-01    0
3777        8.340618e-02    0
3778        7.110019e-02    0
3779        8.762846e-02    0
3780        2.933131e-02    0
3781        7.373247e-02    0
3782        8.479265e-02    0
3783        8.677019e-02    0
3784        8.966667e-02    0
3785        7.936516e-02    0
3786        7.039132e-02    0
3787        4.354518e-02    0
3788        3.807599e-02    0
3789        7.780189e-02    0
3790        5.691213e-02    0
3791        4.556958e-02    0
3792        1.048112e-02    0
3793        4.066425e-02    0
3794        4.762778e-02    0
3795        1.495563e-01    0
3796        8.763042e-02    0
3797        9.055277e-02    0
3798        8.423519e-02    0
3799        2.802976e-01    1
3800        2.810199e-01    1
3801        8.996217e-02    1
3802        1.504750e-01    1
3803        8.966667e-02    1
3804        1.707066e-01    1
3805        2.824829e-01    1
3806        3.056464e-03    1
3807        1.779541e-02    1
3808        1.701955e-01    1
3809        2.383823e-02    1
3810        1.691821e-01    1
3811        2.795714e-01    1
3812        8.996217e-02    1
3813        9.084988e-02    1
3814        3.616686e-01    1
3815        1.631906e-01    1
3816        2.461025e-01    1
3817        9.055479e-02    1
3818        5.967558e-02    1
3819        2.824829e-01    1
3820        1.602604e-01    1
3821        2.846786e-01    1
3822        7.012909e-02    1
3823        2.817533e-01    1
3824        1.701973e-01    1
3825        2.810249e-01    1
3826        2.832137e-01    1
3827        1.636832e-01    1
3828        8.878939e-02    1
3829        7.157997e-02    1
3830        2.752387e-01    1
3831        9.055175e-02    1
3832        1.717273e-01    1
3833        1.861981e-01    1
3834        7.450577e-02    1
3835        1.666654e-01    1
3836        8.878939e-02    1
3837        1.707066e-01    1
3838        2.730881e-01    1
3839        8.849637e-02    1
3840        8.966667e-02    1
3841        2.832137e-01    1
3842        3.717073e-01    1
3843        8.996217e-02    1
3844        2.788464e-01    1
3845        8.878939e-02    1
3846        1.320466e-02    1
3847        1.565602e-01    1
3848        5.130864e-01    1
3849        2.876221e-01    1
3850        4.731948e-02    1
3851        8.878939e-02    1
3852        8.878939e-02    1
3853        3.283116e-01    1
3854        1.350555e-01    1
3855        4.281343e-01    1
3856        4.114615e-01    1
3857        8.423519e-02    1
3858        2.752387e-01    1
3859        1.454777e-01    1
3860        2.702369e-01    1
3861        5.947375e-02    1
3862        1.516632e-02    1
3863        3.717073e-01    1
3864        8.878939e-02    1
3865        4.065537e-02    1
3866        8.451255e-02    1
3867        6.852942e-02    1
3868        7.230153e-02    1
3869        2.702369e-01    1
3870        5.032944e-02    1
3871        2.832112e-01    1
3872        2.832137e-01    1
3873        3.691869e-01    1
3874        6.582162e-02    1
3875        8.395771e-02    1
3876        8.591568e-02    1
3877        2.846786e-01    1
3878        8.908228e-02    1
3879        8.908228e-02    1
3880        2.832137e-01    1
3881        4.140811e-01    1
3882        7.062823e-02    1
3883        2.788464e-01    1
3884        2.817533e-01    1
3885        2.868845e-01    1
3886        9.055479e-02    1
3887        5.706343e-03    1
3888        1.608894e-01    1
3889        2.810249e-01    1
3890        2.766783e-01    1
3891        7.831952e-02    1
3892        8.849637e-02    1
3893        2.164715e-03    1
3894        9.026569e-02    1
3895        2.730881e-01    1
3896        9.144878e-02    1
3897        2.832137e-01    1
3898        2.861456e-01    1
3899        2.766783e-01    1
3900        4.062374e-01    1
3901        8.619999e-02    1
3902        2.730881e-01    1
3903        8.591858e-02    1
3904        2.027884e-02    1
3905        8.096074e-02    1
3906        8.507358e-02    1
3907        2.868820e-01    1
3908        2.861481e-01    1
3909        3.650020e-01    1
3910        2.752387e-01    1
3911        2.494597e-01    1
3912        8.535345e-02    1
3913        8.849737e-02    1
3914        8.176577e-02    1
3915        1.575140e-01    1
3916        4.253954e-02    0
3917        8.879038e-02    1
3918        8.791986e-02    1
3919        4.830969e-02    0
3920        5.947994e-02    0
3921        3.864168e-01    1

Confusion matrix description and interpretation.

# Keep only rows with no missing values
email_subset <- email[complete.cases(email[, c("line_breaks", "exclaim_mess","winner", 
                                               "inherit", "number")]), ]

# Predicted probabilities
predicted.probs <- logistic$fitted.values

# Convert predicted probabilities to classes 
predicted.classes <- ifelse(predicted.probs >= 0.5, 1, 0)

# Confusion matrix 
confusion <- table(
  Predicted = factor(predicted.classes, levels = c(0, 1)),
  Actual  = factor(email_subset$spam, levels = c(0, 1))
)

confusion
         Actual
Predicted    0    1
        0 3551  357
        1    3   10

The confusion matrix indicates the level at which the logistic regression model classified the emails as spam (0.5 probability threshold). The model correctly classified 3551 non-spam emails and 10 spam-mails. But it classified 357 spam emails as non-spam (false negatives) and wrongly put 3 non-spam emails out of 5 spam (false positives). In general, the model did very well in detecting non-spam emails while not good at recognizing the spam emails. Which means that the model is very specific but less sensitive, so it correctly flags very few spam emails at the 0.5 limit. If spam detection should be a priority, reducing the threshold might improve sensitivity.

ROC Curve & AUC Interpretation

# ROC curve & AUC on full data
roc_obj <- roc(response  = email_subset$spam,
               predictor = logistic$fitted.values,        
               levels = c("0", "1"),                                
               direction = "<")

# Print AUC value
auc_val <- auc(roc_obj); auc_val
Area under the curve: 0.7951
# Plot ROC with AUC displayed
plot.roc(roc_obj, print.auc = TRUE, legacy.axes = TRUE,
         xlab = "False Positive Rate (1 - Specificity)",
         ylab = "True Positive Rate (Sensitivity)")

The AUC value for this model is 0.795, which falls in the “fair to good” range. This means the model can correctly distinguish between spam and non spam emails about 79.5% of the time. In other words, the logistic regression model has strong predictive ability, and the selected predictors provide meaningful information for classifying emails as spam.

Conclusion and Future Directions

This analysis checked some of the variables that increase the probability that an email would be placed into the spam category. The logistic regression findings indicated that many of the variables (like the exclamation marks in the message, the word “winner” appearing in the message, inheritance mention and whether the email includes numbers, etc.) are significant predictors of spam. Emails containing more exclamation marks or with keywords such as “winner” and “inherit” were much more likely to be spam, whereas many line breaks or small numbers were less likely. While the model only accounted for about 12% of these variations, it still represented meaningful patterns for answering the research question.

For further research, more fine grained text based features such as word frequency or simple natural language processing tools would be able to be investigated to identify essential features that discriminate spam from regular emails. It could also tune the probability threshold or give it try more advanced models, like decision trees or random forests, to detect spam. Last but not least, a larger and more recent dataset could improve the accuracy of the spam prediction model.