A missing value in R is denoted by NA.

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Question

A missing value in R is denoted by NA.

use R studio

Missing values are different from other values in R in two ways:

1. Any computation involving a missing value will return a missing value.

2. The is.na function will return TRUE if a value is missing and FALSE otherwise.

a) Enter the following code into RStudio.

> x <- c (1, 4, 7, NA, 12, 19,15, 21, 20)

b) Add an appropriate comment to the above code.

Try to find the mean of x.

d) Use is.na to determine if there are missing values.

Add na. rm=TRUE to mean (x) remove missing values.

math Statistics-And-Probability

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Answer 1

Answer #1

> # Q(a)

> x<-c(1,4,7,NA,12,19,15,21,20)
> # A vector x with NA's in it--Q(b)

> # Q(c)
> mean(x)
[1] NA

># Q(d)
> is.na(x)
[1] FALSE FALSE FALSE TRUE FALSE FALSE FALSE
[8] FALSE FALSE
> # Q(e)
> mean(x,na.rm = T)
[1] 12.375

Add a comment

Answer 2

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A missing value in R is denoted by NA.

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