Getting “NA” when I run a standard deviation

Question

Quick question. I read my csv file into the variable data. It has a column label var, which has numerical values.

When I run the command

Answer 1

Try sd(data$var, na.rm=TRUE) and then any NAs in the column var will be ignored. Will also pay to check out your data to make sure the NA's should be NA's and there haven't been read in errors, commands like head(data), tail(data), and str(data) should help with that.