readr: info

• Overview
• Cheatsheet
• Reading

Importing data is the very first step!

You can use readr to import rectangular data.

You can import…

• comma separated (CSV) files with read_csv()
• tab separated files with read_tsv()
• general delimited files with read_delim()
• fixed width files with read_fwf()
• tabular files where columns are separated by white-space with read_table()
• web log files with read_log()

PDF: https://github.com/rstudio/cheatsheets/raw/main/data-import.pdf

R for Data Science: Ch 11 Data import

Package documentation: https://readr.tidyverse.org

readr: exercise

• Read data in
• Clean data
• Raw data

Options 1 & 2 below will get you the same raw dataset for Adélie penguins. Try it out!

Option 1: load using URL

read_csv("https://portal.edirepository.org/nis/dataviewer?packageid=knb-lter-pal.219.3&entityid=002f3893385f710df69eeebe893144ff")

Option 2: load using filepath

read_csv("tutorial/raw_adelie.csv")

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Option 3: Lucky for us, the palmerpenguins 📦 compiles data from all three species together! Check the clean data and raw data tabs to learn more.

penguins contains a clean dataset

penguins <- palmerpenguins::penguins
penguins

# A tibble: 344 × 8
   species island    bill_length_mm bill_depth_mm flipper_length_mm body_mass_g
   <fct>   <fct>              <dbl>         <dbl>             <int>       <int>
 1 Adelie  Torgersen           39.1          18.7               181        3750
 2 Adelie  Torgersen           39.5          17.4               186        3800
 3 Adelie  Torgersen           40.3          18                 195        3250
 4 Adelie  Torgersen           NA            NA                  NA          NA
 5 Adelie  Torgersen           36.7          19.3               193        3450
 6 Adelie  Torgersen           39.3          20.6               190        3650
 7 Adelie  Torgersen           38.9          17.8               181        3625
 8 Adelie  Torgersen           39.2          19.6               195        4675
 9 Adelie  Torgersen           34.1          18.1               193        3475
10 Adelie  Torgersen           42            20.2               190        4250
# ℹ 334 more rows
# ℹ 2 more variables: sex <fct>, year <int>

penguins_raw contains the raw data

palmerpenguins::penguins_raw

# A tibble: 344 × 17
   studyName `Sample Number` Species         Region Island Stage `Individual ID`
   <chr>               <dbl> <chr>           <chr>  <chr>  <chr> <chr>          
 1 PAL0708                 1 Adelie Penguin… Anvers Torge… Adul… N1A1           
 2 PAL0708                 2 Adelie Penguin… Anvers Torge… Adul… N1A2           
 3 PAL0708                 3 Adelie Penguin… Anvers Torge… Adul… N2A1           
 4 PAL0708                 4 Adelie Penguin… Anvers Torge… Adul… N2A2           
 5 PAL0708                 5 Adelie Penguin… Anvers Torge… Adul… N3A1           
 6 PAL0708                 6 Adelie Penguin… Anvers Torge… Adul… N3A2           
 7 PAL0708                 7 Adelie Penguin… Anvers Torge… Adul… N4A1           
 8 PAL0708                 8 Adelie Penguin… Anvers Torge… Adul… N4A2           
 9 PAL0708                 9 Adelie Penguin… Anvers Torge… Adul… N5A1           
10 PAL0708                10 Adelie Penguin… Anvers Torge… Adul… N5A2           
# ℹ 334 more rows
# ℹ 10 more variables: `Clutch Completion` <chr>, `Date Egg` <date>,
#   `Culmen Length (mm)` <dbl>, `Culmen Depth (mm)` <dbl>,
#   `Flipper Length (mm)` <dbl>, `Body Mass (g)` <dbl>, Sex <chr>,
#   `Delta 15 N (o/oo)` <dbl>, `Delta 13 C (o/oo)` <dbl>, Comments <chr>