Overview

This file contains a set of tasks that you need to complete in R for the lab assignment. The tasks may require you to add a code chuck, type code into a chunk, and/or execute code. Some tasks may also ask you to answer specific questions. Don’t forget that you need to acknowledge if you used any resources beyond class materials or got help to complete the assignment.

Additional information and examples relevant to this assignment can be found in the file “PlayingWithDataTutorial.html”.

The data set you will use is different than the one used in the instructions. Pay attention to the differences in the Excel files name, any variable names, and/or object names. You will need to adjust your code accordingly.

Once you have completed the assignment, you will need to knit this R Markdown file to produce an html file. You will then need to upload the .html file and this .Rmd file to AsULearn. Additionally, for this assignment you will upload the Excel file you created.

1. Add your name and the date

The first thing you need to do in this file is to add your name and date in the lines underneath this document’s title (see the code in lines 10 and 11).
Author: jacob Stockotn Date: 9-25-25

2. Getting started

Insert a chunk of code in this section to identify and set your working directory and load packages. We will use the same three packages we did in the last lab: openxlsx, dplyr and tidyverse.

getwd()

## [1] "/Users/jacobstockton/Downloads/PlayingWithDataFall2025"

setwd("/Users/jacobstockton/Downloads/PlayingWithDataFall2025"
)

library(dplyr)

## 
## Attaching package: 'dplyr'

## The following objects are masked from 'package:stats':
## 
##     filter, lag

## The following objects are masked from 'package:base':
## 
##     intersect, setdiff, setequal, union

library(openxlsx)
library(tidyverse)

## ── Attaching core tidyverse packages ──────────────────────── tidyverse 2.0.0 ──
## ✔ forcats   1.0.0     ✔ readr     2.1.5
## ✔ ggplot2   3.5.2     ✔ stringr   1.5.1
## ✔ lubridate 1.9.4     ✔ tibble    3.3.0
## ✔ purrr     1.1.0     ✔ tidyr     1.3.1

## ── 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

3. Load Two Data Sets

Insert a chunk of code in this section to load your data. The Excel file for this assignment has two sheets: grades and attendance. Sheet 1 contains the grades data and Sheet 2 contains the attendance data. You will want to load each sheet into R as separate data objects. The name of the Excel file is different than what is in the instructions. Accordingly, you will need to adjust the code to read in the Excel file that was downloaded as part of the zip file.

GradeBook <- read.xlsx("GradeBook.xlsx" , sheet = 1)
head(GradeBook, 10)

##         X1 Midterm.1 Midterm.2 Assignment.1 Assignment.2 Assignment.3    Final
## 1     Noah  15.00000  12.00000     5.000000     8.000000     5.661442 30.00000
## 2     Jack  11.00478  15.00000     6.771172    10.000000     8.000000 26.00000
## 3    Emily  20.00000  20.00000     8.000000     8.000000     8.154995 20.00000
## 4    Colin  20.00000  17.00000     8.000000     5.000000     8.673615 25.00000
## 5   Hannah  10.00000  17.00000     6.802136     9.604730    10.000000 20.00000
## 6   Aubrie  20.00000  14.00000     5.000000     6.000000     6.000000 17.78453
## 7   Olivia  14.00000  17.72971    10.000000     7.000000     6.000000 26.00000
## 8   Duncan   9.62783  16.00000     7.000000     8.065708     8.000000 18.95910
## 9    Katie  19.00000  12.00000     9.000000     8.000000     8.967217 20.00000
## 10 Jackson  17.00000  15.00000     8.000000     6.000000     2.549882 25.00000

Attendance <- read.xlsx("GradeBook.xlsx" , sheet = 2)
head(Attendance, 10)

##       Name 1 2 3 4 5
## 1     Noah 1 1 1 1 1
## 2     Jack 0 1 1 1 1
## 3    Emily 1 1 0 0 1
## 4    Colin 1 0 1 1 1
## 5   Hannah 1 1 0 1 1
## 6   Aubrie 1 1 1 1 1
## 7   Olivia 1 1 1 1 1
## 8   Duncan 0 1 0 0 1
## 9    Katie 1 1 1 1 1
## 10 Jackson 1 0 1 1 1

4. Take a look at your data

Insert a chunk of code in this section and display the first 15 observations of each data set.

head(GradeBook, 15)

##          X1 Midterm.1 Midterm.2 Assignment.1 Assignment.2 Assignment.3    Final
## 1      Noah  15.00000  12.00000     5.000000     8.000000     5.661442 30.00000
## 2      Jack  11.00478  15.00000     6.771172    10.000000     8.000000 26.00000
## 3     Emily  20.00000  20.00000     8.000000     8.000000     8.154995 20.00000
## 4     Colin  20.00000  17.00000     8.000000     5.000000     8.673615 25.00000
## 5    Hannah  10.00000  17.00000     6.802136     9.604730    10.000000 20.00000
## 6    Aubrie  20.00000  14.00000     5.000000     6.000000     6.000000 17.78453
## 7    Olivia  14.00000  17.72971    10.000000     7.000000     6.000000 26.00000
## 8    Duncan   9.62783  16.00000     7.000000     8.065708     8.000000 18.95910
## 9     Katie  19.00000  12.00000     9.000000     8.000000     8.967217 20.00000
## 10  Jackson  17.00000  15.00000     8.000000     6.000000     2.549882 25.00000
## 11 Victoria  11.00000   9.93236     8.000000    10.000000     6.701154 26.00000
## 12  Matthew  10.00000  13.00000    10.000000     9.000000    10.000000 26.00000
## 13  Michael   7.00000  11.00000     8.000000    10.000000    10.000000 18.00000
## 14   Olivia  14.00000  12.00000     6.000000     7.000000     8.000000 29.00000
## 15 Samantha   6.00000  10.00000     6.000000     8.000000     6.000000 19.00000

head(Attendance, 15)

##        Name 1 2 3 4 5
## 1      Noah 1 1 1 1 1
## 2      Jack 0 1 1 1 1
## 3     Emily 1 1 0 0 1
## 4     Colin 1 0 1 1 1
## 5    Hannah 1 1 0 1 1
## 6    Aubrie 1 1 1 1 1
## 7    Olivia 1 1 1 1 1
## 8    Duncan 0 1 0 0 1
## 9     Katie 1 1 1 1 1
## 10  Jackson 1 0 1 1 1
## 11 Victoria 1 1 1 1 1
## 12  Matthew 1 1 0 1 0
## 13  Michael 0 1 1 1 1
## 14   Olivia 1 1 1 1 1
## 15 Samantha 1 0 1 1 1

5. Rename Variables

You will need to insert chunks of code and rename variables in your data sets in this section. I recommend trying to do only one thing per chunk of code.

In the attendance data set, you will need to rename the variables that are currently numbers into text. In the instructions, I called each variable Class and then the number of that class, for example Class1. Instead of using the same variable name as I did, you should call each variable a Meeting.

Attendance %>%
  rename(Meeting1 = "1",
         Meeting2 = "2",
         Meeting3 = "3",
         Meeting4 = "4",
         Meeting5 = "5") -> Attendance

GradeBook %>%
  rename(Name = "X1",
         Midterm1 = Midterm.1,
         Midterm2 = Midterm.2,
         Assignment1 = Assignment.1,
         Assignment2 = Assignment.2,
         Assignment3 = Assignment.3,
         Final = Final) -> GradeBook

After renaming the variables, look at the first 15 observations for each data set.

head(Attendance, 15)

##        Name Meeting1 Meeting2 Meeting3 Meeting4 Meeting5
## 1      Noah        1        1        1        1        1
## 2      Jack        0        1        1        1        1
## 3     Emily        1        1        0        0        1
## 4     Colin        1        0        1        1        1
## 5    Hannah        1        1        0        1        1
## 6    Aubrie        1        1        1        1        1
## 7    Olivia        1        1        1        1        1
## 8    Duncan        0        1        0        0        1
## 9     Katie        1        1        1        1        1
## 10  Jackson        1        0        1        1        1
## 11 Victoria        1        1        1        1        1
## 12  Matthew        1        1        0        1        0
## 13  Michael        0        1        1        1        1
## 14   Olivia        1        1        1        1        1
## 15 Samantha        1        0        1        1        1

head(GradeBook, 15)

##        Name Midterm1 Midterm2 Assignment1 Assignment2 Assignment3    Final
## 1      Noah 15.00000 12.00000    5.000000    8.000000    5.661442 30.00000
## 2      Jack 11.00478 15.00000    6.771172   10.000000    8.000000 26.00000
## 3     Emily 20.00000 20.00000    8.000000    8.000000    8.154995 20.00000
## 4     Colin 20.00000 17.00000    8.000000    5.000000    8.673615 25.00000
## 5    Hannah 10.00000 17.00000    6.802136    9.604730   10.000000 20.00000
## 6    Aubrie 20.00000 14.00000    5.000000    6.000000    6.000000 17.78453
## 7    Olivia 14.00000 17.72971   10.000000    7.000000    6.000000 26.00000
## 8    Duncan  9.62783 16.00000    7.000000    8.065708    8.000000 18.95910
## 9     Katie 19.00000 12.00000    9.000000    8.000000    8.967217 20.00000
## 10  Jackson 17.00000 15.00000    8.000000    6.000000    2.549882 25.00000
## 11 Victoria 11.00000  9.93236    8.000000   10.000000    6.701154 26.00000
## 12  Matthew 10.00000 13.00000   10.000000    9.000000   10.000000 26.00000
## 13  Michael  7.00000 11.00000    8.000000   10.000000   10.000000 18.00000
## 14   Olivia 14.00000 12.00000    6.000000    7.000000    8.000000 29.00000
## 15 Samantha  6.00000 10.00000    6.000000    8.000000    6.000000 19.00000

6. Creating New Attendance Variables

In this section, insert chunks and create the following variables in your attendance data set.

Total number of classes attended.

Attendance  %>%
  mutate(Present = (Meeting1 + Meeting2 + Meeting3 + Meeting4 + Meeting5)) -> Attendance

Total number of classes absent. There are a total of 5 classes that students could potentially attend.

Attendance  %>%
  mutate(Absent = (Meeting1 + Meeting2 + Meeting3 + Meeting4 + Meeting5)) -> Attendance

Total number of unexcused absences. Students are allowed up to 2 excused absences.

Attendance  %>%
  mutate(Unexcused = (Meeting1 + Meeting2 + Meeting3 + Meeting4 + Meeting5)) -> Attendance

Penalty on grade for unexcused absences. For each unexcused absence, a student’s grade will be penalized 0.5 points. Based on the number of unexcused absences, calculate the total penalty that should be applied to their grade.

After you have completed these calculations, take a look at the first 15 observations in your data set.

head(GradeBook)

##     Name Midterm1 Midterm2 Assignment1 Assignment2 Assignment3    Final
## 1   Noah 15.00000       12    5.000000     8.00000    5.661442 30.00000
## 2   Jack 11.00478       15    6.771172    10.00000    8.000000 26.00000
## 3  Emily 20.00000       20    8.000000     8.00000    8.154995 20.00000
## 4  Colin 20.00000       17    8.000000     5.00000    8.673615 25.00000
## 5 Hannah 10.00000       17    6.802136     9.60473   10.000000 20.00000
## 6 Aubrie 20.00000       14    5.000000     6.00000    6.000000 17.78453

7. Create New Grade Variables

In this section, insert chunks and create the following variables in your grade book data set.

Each assignment in class is worth 10 points. Create a new variable for each assignment where you convert the raw score into a percentage.

GradeBook %>%
  mutate(PerAssn1 = (Assignment1/10)*100) -> GradeBook

GradeBook %>%
  mutate(PerAssn2 = (Assignment2/10)*100) -> GradeBook

GradeBook %>%
  mutate(PerAssn3 = (Assignment3/10)*100) -> GradeBook

print(GradeBook$Assignment1)

##  [1]  5.000000  6.771172  8.000000  8.000000  6.802136  5.000000 10.000000
##  [8]  7.000000  9.000000  8.000000  8.000000 10.000000  8.000000  6.000000
## [15]  6.000000  9.000000

print(GradeBook$Assignment2)

##  [1]  8.000000 10.000000  8.000000  5.000000  9.604730  6.000000  7.000000
##  [8]  8.065708  8.000000  6.000000 10.000000  9.000000 10.000000  7.000000
## [15]  8.000000  7.000000

print(GradeBook$Assignment3)

##  [1]  5.661442  8.000000  8.154995  8.673615 10.000000  6.000000  6.000000
##  [8]  8.000000  8.967217  2.549882  6.701154 10.000000 10.000000  8.000000
## [15]  6.000000  7.000000

Each midterm in the class is worth 20 points. Create a new variable for each midterm where you convert the raw score into a percentage.

GradeBook %>%
  mutate(PerMT1 = (Midterm1/20)*100) -> GradeBook

GradeBook %>%
  mutate(PerMT2 = (Midterm2/20)*100) -> GradeBook

print(GradeBook$Midterm1)

##  [1] 15.00000 11.00478 20.00000 20.00000 10.00000 20.00000 14.00000  9.62783
##  [9] 19.00000 17.00000 11.00000 10.00000  7.00000 14.00000  6.00000 11.00000

print(GradeBook$Midterm2)

##  [1] 12.00000 15.00000 20.00000 17.00000 17.00000 14.00000 17.72971 16.00000
##  [9] 12.00000 15.00000  9.93236 13.00000 11.00000 12.00000 10.00000 12.00000

The final exam is worth 30 points. Create a new variable for the final where you convert the raw score into a percentage.

GradeBook %>%
  mutate(PerFnl = (Final/30)*100) -> GradeBook

print(GradeBook$Final)

##  [1] 30.00000 26.00000 20.00000 25.00000 20.00000 17.78453 26.00000 18.95910
##  [9] 20.00000 25.00000 26.00000 26.00000 18.00000 29.00000 19.00000 28.00000

There are multiple ways one can calculate the overall grade for the class. You are going to calculate the final grade in two different ways.

You should provide equal weight to each item in the class regardless of the number of points it was originally worth. To do this, you should add together the percentage grades that you calculated and divide by 600 (you have 6 assignments, each one is worth up to 100 points once the grades were converted to percents).

GradeBook %>%
  mutate(FinalGrade = (Assignment1 + Assignment2 + Assignment2 + Midterm1 + Midterm2 + Final)/600) -> GradeBook

You should weight items based on the number of points each was originally worth. The most straightforward way to do this is to add together the raw scores for each item and then divide by the total number of points possible. You already have the information you need to calculate the total number of points possible because you know how many points each type of assignment is worth and you know how many of each type of assignment is in the grade book.

GradeBook %>%
  mutate(
    TotalEarned = Assignment1 + Assignment2 + Assignment3 + Midterm1 + Midterm2, Final,
    TotalPossible = (10 + 10 + 10) + (20 + 20) + 30,
    WeightedGrade = (TotalEarned / TotalPossible) * 100
  ) -> GradeBook

After you have completed these calucations, take a look at the first 15 observations in your data set.

head(GradeBook)

##     Name Midterm1 Midterm2 Assignment1 Assignment2 Assignment3    Final
## 1   Noah 15.00000       12    5.000000     8.00000    5.661442 30.00000
## 2   Jack 11.00478       15    6.771172    10.00000    8.000000 26.00000
## 3  Emily 20.00000       20    8.000000     8.00000    8.154995 20.00000
## 4  Colin 20.00000       17    8.000000     5.00000    8.673615 25.00000
## 5 Hannah 10.00000       17    6.802136     9.60473   10.000000 20.00000
## 6 Aubrie 20.00000       14    5.000000     6.00000    6.000000 17.78453
##   PerAssn1 PerAssn2  PerAssn3    PerMT1 PerMT2    PerFnl FinalGrade TotalEarned
## 1 50.00000  80.0000  56.61442  75.00000     60 100.00000  0.1300000    45.66144
## 2 67.71172 100.0000  80.00000  55.02392     75  86.66667  0.1312933    50.77596
## 3 80.00000  80.0000  81.54995 100.00000    100  66.66667  0.1400000    64.15500
## 4 80.00000  50.0000  86.73615 100.00000     85  83.33333  0.1333333    58.67361
## 5 68.02136  96.0473 100.00000  50.00000     85  66.66667  0.1216860    53.40687
## 6 50.00000  60.0000  60.00000 100.00000     70  59.28176  0.1146409    51.00000
##   TotalPossible WeightedGrade
## 1           100      45.66144
## 2           100      50.77596
## 3           100      64.15500
## 4           100      58.67361
## 5           100      53.40687
## 6           100      51.00000

8. Create Objects Containing a Single Value

In this section, insert chunks and calculate the mean, minimum, and maximum for 3 different variables (midterm 2, assignment 3, and the final exam) in the grade book data set. Use the variables that report the scores as a percentage that you created.

min(GradeBook$PerMT2)

## [1] 49.6618

mean(GradeBook$PerMT2)

## [1] 69.8944

max(GradeBook$PerMT2)

## [1] 100

mean(GradeBook$PerAssn3)

## [1] 74.81769

min(GradeBook$PerAssn3)

## [1] 25.49882

max(GradeBook$PerAssn3)

## [1] 100

mean(GradeBook$PerFnl)

## [1] 78.07159

min(GradeBook$PerFnl)

## [1] 59.28176

max(GradeBook$PerFnl)

## [1] 100

9. Create Objects Containing Multiple Values

In this section, insert chunks and produce the following objects that will contain values for each variable in the data set.

Using the attendance data, create two objects. One object should contain the total number of students attending a class session. One object should contain the mean number of students attending a class session.

attendsum <- sapply(Attendance[ , c("Meeting1", "Meeting2", "Meeting3", "Meeting4", "Meeting5")], sum)

attendmean <- sapply(Attendance[ , c("Meeting1", "Meeting2", "Meeting3", "Meeting4", "Meeting5")], mean)

Using the grade book data, create three objects for the mean, min, and max grades for each of the variable in the data set.

gradebookmin <- sapply(GradeBook[, c("Assignment1", "Assignment2", "Assignment3")], min)

gradebookmean <- sapply(GradeBook[, c("Assignment1", "Assignment2", "Assignment3")], mean)

gradebookmax <- sapply(GradeBook[, c("Assignment1", "Assignment2", "Assignment3")], max)

10. Combining Objects

In this section, insert chunks of code that will combine objects together.

Combine the two objects you created using the attendance data set in the last question into a single object. Print the object where you stored these objects.

AttedanceSummary <- rbind(attendsum, attendmean)

print(AttedanceSummary)

##            Meeting1 Meeting2 Meeting3 Meeting4 Meeting5
## attendsum   13.0000  13.0000    12.00   14.000  15.0000
## attendmean   0.8125   0.8125     0.75    0.875   0.9375

Combine the three objects you created using the grade book data set in the last question into a single object. Print the object where you stored these objects.

GradeBookSummary <- rbind(gradebookmax, gradebookmean, gradebookmin)

print(GradeBookSummary)

##               Assignment1 Assignment2 Assignment3
## gradebookmax    10.000000   10.000000   10.000000
## gradebookmean    7.535832    7.916902    7.481769
## gradebookmin     5.000000    5.000000    2.549882

11. Export Data Sets

In this section, insert a chunk of code to export the grade book data, the attendance data, the summary grade book, and the summary attendance as one Excel file. Make sure to name your data file something different than the Excel file that had the original data that you loaded into R for this assignment.

write.xlsx(AttedanceSummary, file = "AttendanceSummary.xlsx")

sheets<- list("Grades" = GradeBook, "Attendance" = Attendance, AttendanceSummary = "AttedanceSummary")

write.xlsx(sheets, file = "combined.xlsx")

12. Did you recieve help?

Enter the names of anyone one that assisted you with completing this lab. If no one helped you complete the assignment, just type out that no one helped you

Yes: Kerryn Lowry, Brett Clayton

13. Did you provide anyone help with completing this lab?

Enter the names of anyone that you assisted with completing this lab. If you did not help anyone, then just type out that you didn’t help anyone. Yes: Brett Clayton, Summer Simpson

14. Knit the Document

Click the “Knit” button to publish your work as an html document. This document or file will appear in the folder specified by your working directory. You will need to upload both this RMarkdown file and the html file it produces to AsU Learn to get all of the lab points for this week. Additionally, you need to upload the Excel file that you exported when completing the assignment to get all of the lab points for this week.

PS/CJ3115 Fall 2025: Playing with Data

(Your First and Last Name Here)

(The Date Here)