R programming: Count the number of NA values in a data frame column

R programming: Data frame Exercise-23 with Solution

Write a R program to count the number of NA values in a data frame column.

Sample Solution:

R Programming Code:

exam_data = data.frame(
name = c('Anastasia', 'Dima', 'Katherine', 'James', 'Emily', 'Michael', 'Matthew', 'Laura', 'Kevin', 'Jonas'),
score = c(12.5, 9, 16.5, 12, 9, 20, 14.5, 13.5, 8, 19),
attempts = c(1, NA, 2, NA, 2, NA, 1, NA, 2, 1),
qualify = c('yes', 'no', 'yes', 'no', 'no', 'yes', 'yes', 'no', 'no', 'yes')
print("Original dataframe:")
print("The number of NA values in attempts column:")

Sample Output:

[1] "Original dataframe:"
        name score attempts qualify
1  Anastasia  12.5        1     yes
2       Dima   9.0       NA      no
3  Katherine  16.5        2     yes
4      James  12.0       NA      no
5      Emily   9.0        2      no
6    Michael  20.0       NA     yes
7    Matthew  14.5        1     yes
8      Laura  13.5       NA      no
9      Kevin   8.0        2      no
10     Jonas  19.0        1     yes
[1] "The number of NA values in attempts column:"
[1] 4

R Programming Code Editor:

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: Write a R program to save the information of a data frame in a file and display the information of the file.
Next: Write a R program to create a data frame using two given vectors and display the duplicated elements and unique rows of the said data frame.

Test your Programming skills with w3resource's quiz.

What is the difficulty level of this exercise?

Follow us on Facebook and Twitter for latest update.