Getting “NA” when I run a standard deviation
问题 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 sd(data$var) I get [1] NA instead of my standard deviation. Could you please help me figure out what I am doing wrong? 回答1: Try sd(data$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) ,