Lab 1.1 KEY – EDS 123

Setup

# load packages ----
library(tidyverse)
library(palmerpenguins)

Tidy Data Review

Example untidy / wide data:

# create some untidy temperature data ----
temp_data_wide <- tribble(
  ~date, ~station1, ~station2,  ~station3,
  "2023-10-01", 30.1, 29.8,  31.2,
  "2023-11-01", 28.6, 29.1,  33.4,
  "2023-12-01", 29.9, 28.5,  32.3
)

# print it out ----
print(temp_data_wide)

# A tibble: 3 × 4
  date       station1 station2 station3
  <chr>         <dbl>    <dbl>    <dbl>
1 2023-10-01     30.1     29.8     31.2
2 2023-11-01     28.6     29.1     33.4
3 2023-12-01     29.9     28.5     32.3

Using pivot_longer() to “lengthen” / tidy our data:

# convert data from wide > long ----
temp_data_long <- temp_data_wide |> 
  pivot_longer(cols = starts_with("station"),
               names_to = "station_id",
               values_to = "temp_c")

# print it out ----
print(temp_data_long)

# A tibble: 9 × 3
  date       station_id temp_c
  <chr>      <chr>       <dbl>
1 2023-10-01 station1     30.1
2 2023-10-01 station2     29.8
3 2023-10-01 station3     31.2
4 2023-11-01 station1     28.6
5 2023-11-01 station2     29.1
6 2023-11-01 station3     33.4
7 2023-12-01 station1     29.9
8 2023-12-01 station2     28.5
9 2023-12-01 station3     32.3