Grammar of Data

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Data Manipulation Tools: dplyr – Pt 3 Intro to the Grammar of Data Manipulation with R

Data wrangling is too often the most time-consuming part of data science and applied statistics. Two tidyverse packages, tidyr and dplyr, help make data manipulation tasks easier. Keep your code clean and clear and reduce the cognitive load required for common but often complex data science tasks.

dplyr docs: dplyr.tidyverse.org/reference/

Pt. 1: What is data wrangling? Intro, Motivation, Outline, Setup https://youtu.be/jOd65mR1zfw

/01:44 Intro and what’s covered Ground Rules
/02:40 What’s a tibble
/04:50 Use View
/05:25 The Pipe operator:
/07:20 What do I mean by data wrangling?

Pt. 2: Tidy Data and tidyr https://youtu.be/1ELALQlO-yM

/00:48 Goal 1 Making your data suitable for R
/01:40 tidyr “Tidy” Data introduced and motivated
/08:10 tidyr::gather
/12:30 tidyr::spread
/15:23 tidyr::unite
/15:23 tidyr::separate

Pt. 3: Data manipulation tools: dplyr https://youtu.be/Zc_ufg4uW4U

00.40 setup
02:00 dplyr::select
03:40 dplyr::filter
05:05 dplyr::mutate
07:05 dplyr::summarise
08:30 dplyr::arrange
09:55 Combining these tools with the pipe (Setup for the Grammar of Data Manipulation)
11:45 dplyr::group_by

Pt. 4: Working with Two Datasets: Binds, Set Operations, and Joins https://youtu.be/AuBgYDCg1Cg Combining two datasets together

/00.42 dplyr::bind_cols
/01:27 dplyr::bind_rows
/01:42 Set operations dplyr::union, dplyr::intersect, dplyr::set_diff
/02:15 joining data dplyr::left_join, dplyr::inner_join, dplyr::right_join, dplyr::full_join,

Cheatsheets: https://www.rstudio.com/resources/cheatsheets/

Documentation: tidyr docs: tidyr.tidyverse.org/reference/

tidyr vignette: https://cran.r-project.org/web/packages/tidyr/vignettes/tidy-data.html dplyr docs: http://dplyr.tidyverse.org/reference/
dplyr one-table vignette: https://cran.r-project.org/web/packages/dplyr/vignettes/dplyr.html
dplyr two-table (join operations) vignette: https://cran.r-project.org/web/packages/dplyr/vignettes/two-table.html