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 d...

I have a table: LocationId OriginalValue Mean 1 0.45 3.99 2 0.33 3.99 3 16.74 3.99 4 3.31 3.99 and so forth... How would I work out the Standard Deviation using this table and also what would ...

var, sd, cor functions in {stats} use n-1 as a denominator (where n the number of observations). Out of curiosity, are there equivalent function that use n as a denominator?