The Verbs

Edited from Ben Baumer’s Lecture

Nic Schwab

dplyr lives in the tidyverse

SDS 100 Lab 4

In lab 4 you learned about these verbs:

• select()

  • subsets columns

• filter()

  • subsets rows

• mutate()

  • creates new variables (or columns)

• arrange() and arrange(desc())

We will also use:

• group_by()

  • to group the data before summarizing

• summarize()

  • to summarize data

• rename()

  • to rename columns

The idea

You can get good at a few functions and do a lot.

The first argument is a data frame.

• its a special kind called a tibble.

The output of the wrangling functions is a data frame.

When we wrangle we are not altering the original data.

• It still exists.

• You can start over.

What is a tibble?

• Object of class tbl

• Its different from a data frame.

Practice wrangling

In class MDSR Problems 1 and 2