Assignment 3

Author

Brady Heath

Go to the shared posit.cloud workspace for this class and open the lab03_assign03 project. Open the assign03.qmd file and complete the exercises.

We will be using two files complied from the American Community Survey five year estimates for 2022 (which is built over a sample of surveys sent out over the five year period from 2017-2022). Both files contain data from towns in Cumberland County, Maine. The first file loaded is cumberland_places.csv and contains the following columns:

town - town name
county - Cumberland for all records
state - ME for all records
pop - an estimate of the population
top5 - median income for the top 5% of earners in the town
median_income - median income for all adults in the town
median_age - median age for the town

The second file, cumberland_edu.csv contains:

town, county, state - same values as the first file
n_pop_over_25 - the number of people over 25 in the town
n_masters_above - the number of people over 25 that have a Master’s degree or higher in the town.

We’ll start by loading the tidyverse family of packages, ggrepel for our graph, and gt (optional) for making pretty tables, and read in the data into two tibbles (cumberland_places and cumberland_edu). We’ll be using the message: false option to suppress the output message from loading tidyverse and gt

```{r}
#| message: false
library(tidyverse)
library(ggrepel)
library(gt)
cumberland_places <- read_csv("https://jsuleiman.com/datasets/cumberland_places.csv")
cumberland_edu <- read_csv("https://jsuleiman.com/datasets/cumberland_edu.csv")
```

1 Exercises

There are five exercises in this assignment. The Grading Rubric is available at the end of this document. You will need to create your own code chunks for this assignment. Remember, you can do this with Insert -> Executable Cell -> R while in Visual mode.

1.1 Exercise 1

Create a tibble called maine_data that joins the two tibbles. Think about what matching columns you will be using in your join by clause. Review the joined data and state explicitly in the narrative whether you see any NA values and why you think they might exist.

maine_data <- left_join(cumberland_places, cumberland_edu, by = c("town", "county", "state"))
summary(maine_data)

     town              county             state                pop       
 Length:28          Length:28          Length:28          Min.   :   20  
 Class :character   Class :character   Class :character   1st Qu.: 3367  
 Mode  :character   Mode  :character   Mode  :character   Median : 6994  
                                                          Mean   :10834  
                                                          3rd Qu.:13878  
                                                          Max.   :68280  
                                                                         
      top5        median_income      median_age    n_pop_over_25  
 Min.   :212856   Min.   : 55020   Min.   :36.50   Min.   :   20  
 1st Qu.:321835   1st Qu.: 71432   1st Qu.:41.30   1st Qu.: 2785  
 Median :418666   Median : 91408   Median :45.20   Median : 4997  
 Mean   :482965   Mean   : 91901   Mean   :46.34   Mean   : 7939  
 3rd Qu.:588422   3rd Qu.:101726   3rd Qu.:49.02   3rd Qu.: 9447  
 Max.   :998035   Max.   :144250   Max.   :68.70   Max.   :51898  
 NA's   :1                                                        
 n_masters_above  
 Min.   :    4.0  
 1st Qu.:  363.2  
 Median :  752.5  
 Mean   : 1621.0  
 3rd Qu.: 1983.5  
 Max.   :12233.0

1.2 Exercise 2

Since the dataset only has 28 towns, you don’t need to show code to answer the questions in Exercise 2, you can simply look at the table and add the answers to your narrative. Make sure you specify the town name and the actual value that answers the question.

maine_data

# A tibble: 28 × 9
   town         county state   pop   top5 median_income median_age n_pop_over_25
   <chr>        <chr>  <chr> <dbl>  <dbl>         <dbl>      <dbl>         <dbl>
 1 Baldwin      Cumbe… ME     1180 212856         68625       50.3           927
 2 Bridgton     Cumbe… ME     5471 315914         78546       47.6          4170
 3 Brunswick    Cumbe… ME    21691 418666         71236       41.3         14910
 4 Cape Elizab… Cumbe… ME     9519 833724        144250       48.6          6809
 5 Casco        Cumbe… ME     3657 392392         60708       51.1          3006
 6 Chebeague I… Cumbe… ME      597 668189         58571       55.6           430
 7 Cumberland   Cumbe… ME     8443 998035        144167       40.6          5782
 8 Falmouth     Cumbe… ME    12504 919545        144118       47.7          8800
 9 Freeport     Cumbe… ME     8700 535344         95398       47.5          6516
10 Frye Island  Cumbe… ME       20     NA        101250       68.7            20
# ℹ 18 more rows
# ℹ 1 more variable: n_masters_above <dbl>

1.3 Exercise 3

Add a column to maine_data called to pct_grad_degree that shows the percentage of graduate degrees for the town, which is defined as n_masters_above / n_pop_over_25

maine_data <- maine_data %>%
  mutate(pct_grad_degree = n_masters_above / n_pop_over_25)

1.4 Exercise 4

What town has the lowest percentage of graduate degrees for people over 25?

lowest_grad_town <- maine_data %>%
  filter(!is.na(pct_grad_degree)) %>%
  arrange(pct_grad_degree) %>%
  slice(1) %>%
  select(town, pct_grad_degree)

lowest_grad_town

# A tibble: 1 × 2
  town    pct_grad_degree
  <chr>             <dbl>
1 Baldwin          0.0949

1.5 Exercise 5

Replicate this graph. Note: use geom_label_repel() just like you would use geom_label() Discuss any patterns you see in the narrative.

ggplot(maine_data, aes(x = median_income, y = pct_grad_degree, label = town)) +
  geom_point() +
  geom_label_repel(size = 3, color = "blue") +
  labs(x = "Median Income", y = "Percentage of Graduate Degrees") +
  theme_minimal()

2 Submission

To submit your assignment:

Change the author name to your name in the YAML portion at the top of this document
Render your document to html and publish it to RPubs.
Submit the link to your Rpubs document in the Brightspace comments section for this assignment.
Click on the “Add a File” button and upload your .qmd file for this assignment to Brightspace.

3 Grading Rubric

Item (percent overall)	67% - minor issues	33% - moderate issues	0% - major issues or not attempted
Narrative: typos and grammatical errors (8%)
Document formatting: correctly implemented instructions (8%)
Exercises (15% each)
Submitted properly to Brightspace (9%)	NA	NA	You must submit according to instructions to receive any credit for this portion.

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