na_if

Requires dplyr package.

• Usage
• Example

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Usage

Used to assign NA to invalid values of a variable. This is required in order to compute accurate summary statistics.

Usage:

dataframe$variable <- na_if(dataframe$variable, invalid_value)

• Replaces all instances of invalid_value in dataframe$variable with NA.

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Example

rm(list=ls())
library(dplyr)

df <- read.csv("IPUMS_ACS2019_CA_1.csv")

df$INCWAGE <- na_if(df$INCWAGE, 999999)
df$INCWAGE <- na_if(df$INCWAGE, 999998)

This code replaces all instances of 999999 and 999998 in df$INCWAGE with NA.