NA

The na_example dataset represents a series of counts. It is included in the dslabs package. You can quickly examine the object using

library(dslabs)
data(na_example)
str(na_example)

However, when we compute the average we obtain an NA. You can see this by typing

mean(na_example)

This exercise is part of the course

Data Science R Basics

View Course

Exercise instructions

The is.na returns a logical vector that tells us which entries are NA. Assign the logical vector that is returned by is.na(na_example) to an object called ind.
Determine how many NAs na_example has, using the sum command.

Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

# Using new dataset 
library(dslabs)
data(na_example)

# Checking the structure 
str(na_example)

# Find out the mean of the entire dataset 
mean(na_example)

# Use is.na to create a logical index ind that tells which entries are NA

# Determine how many NA ind has using the sum function

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