Getting an Overview: Exercises

# install.packages("tidyverse")
# install.packages("here")

library(tidyverse)
library(here)

## Load the data
characters <- readRDS(file = here::here("raw_data", "characters.rds"))
psych_stats <- read.csv(
  file = here::here("raw_data", "psych_stats.csv"),
  sep = ";"
)

Exercise 1

Take a look at the characters data set.

  1. How many rows and how many columns does the data frame have?

Use str().

str(characters)
'data.frame':   889 obs. of  7 variables:
 $ id        : chr  "F2" "F1" "F5" "F4" ...
 $ name      : chr  "Monica Geller" "Rachel Green" "Chandler Bing" "Joey Tribbiani" ...
 $ uni_id    : chr  "F" "F" "F" "F" ...
 $ uni_name  : chr  "Friends" "Friends" "Friends" "Friends" ...
 $ notability: num  79.7 76.7 74.4 74.3 72.6 51.6 86.5 84.2 82.6 65.6 ...
 $ link      : chr  "https://openpsychometrics.org/tests/characters/stats/F/2" "https://openpsychometrics.org/tests/characters/stats/F/1" "https://openpsychometrics.org/tests/characters/stats/F/5" "https://openpsychometrics.org/tests/characters/stats/F/4" ...
 $ image_link: chr  "https://openpsychometrics.org/tests/characters/test-resources/pics/F/2.jpg" "https://openpsychometrics.org/tests/characters/test-resources/pics/F/1.jpg" "https://openpsychometrics.org/tests/characters/test-resources/pics/F/5.jpg" "https://openpsychometrics.org/tests/characters/test-resources/pics/F/4.jpg" ...

The data frame has 889 rows and 7 columns.

  1. What show are the first characters in the data frame from?

Use head().

head(characters)
  id           name uni_id uni_name notability
1 F2  Monica Geller      F  Friends       79.7
2 F1   Rachel Green      F  Friends       76.7
3 F5  Chandler Bing      F  Friends       74.4
4 F4 Joey Tribbiani      F  Friends       74.3
5 F3  Phoebe Buffay      F  Friends       72.6
6 F6    Ross Geller      F  Friends       51.6
                                                      link
1 https://openpsychometrics.org/tests/characters/stats/F/2
2 https://openpsychometrics.org/tests/characters/stats/F/1
3 https://openpsychometrics.org/tests/characters/stats/F/5
4 https://openpsychometrics.org/tests/characters/stats/F/4
5 https://openpsychometrics.org/tests/characters/stats/F/3
6 https://openpsychometrics.org/tests/characters/stats/F/6
                                                                  image_link
1 https://openpsychometrics.org/tests/characters/test-resources/pics/F/2.jpg
2 https://openpsychometrics.org/tests/characters/test-resources/pics/F/1.jpg
3 https://openpsychometrics.org/tests/characters/test-resources/pics/F/5.jpg
4 https://openpsychometrics.org/tests/characters/test-resources/pics/F/4.jpg
5 https://openpsychometrics.org/tests/characters/test-resources/pics/F/3.jpg
6 https://openpsychometrics.org/tests/characters/test-resources/pics/F/6.jpg

They are from Friends.