11: Cleaning Data in R

FRONT

BACK

What package allows you to throw errors if a variable is checked, and found to be an undesired data type?

assertive

What tidyverse package allows you to better manipulate strings? What function in this package allows you to remove parts of strings that match a specified pattern?

stringr

str_remove()

How do you covert a factor to a numeric?

as.numeric(as.character(factorName))

What are the types of qualitative and quantitative data? Define them

Nominal: Red, blue, Yellow

Ordinal: First, Second, Third

Discrete: 1, 2, 3, 4

Continuous: 1.0, 2.0, 3.0, 4.0

What data type should a variable represented by discrete numbers be?

Factor

In the data checking package, what function throws an error if any value in a series falls outside of a range?

assert_all_are_in_closed_range()

What function replaces data in dplyr?

replace()

In the data checking package, what function checks that all dates in a set are from the past?

assert_all_are_in_past()

What function gives a vector of booleans, with each TRUE value representing a duplicated row?

duplicated()

What does the sum of a boolean vector return?

It returns the number of true values in the vector

What dplyr function returns a dataframe without duplicates?

distinct()

FIRST PASS

FIRST PASS

SECOND PASS

SECOND PASS