# Comparing standard deviations

#### Jeremy1

##### New Member
Hi,

I have data about incomes from two groups and I want to see which group's variance is bigger.

The two groups income is measured in the same currency, so can I simply compare the standard deviation? Or should I use the coefficient of variation?

(The means are different)

You could use the $$F_{max}$$ test also I think it's called Hartley. Never used it myself but learned about it in stats 1. It's similar (maybe the same thing) to what an anova does when it compares variances.