How to deal with missing values in R

There are different ways to treat missing values in R. One of the most commom ways to do that, is to replace the NA values with the mean (or mode). You can do that in a vector (or a column/line from  a data frame) using the is.na function:

> testena <- c(2,3,8,NA,9)
> testena[is.na(testena)] <- mean(testena,na.rm=T)
> testena
[1] 2.0 3.0 8.0 5.5 9.0

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