[R] What's going on? (strange standard deviation)

[Matej Cepl]

I have probably misunderstood something (again :-():

	> CEMPLOY<-TEMPLOY[!is.na(TEMPLOY)]
	> sum(CEMPLOY^2/length(CEMPLOY))-mean(CEMPLOY)^2
	[1] 30877.28
	> var(TEMPLOY,na.rm=TRUE)
	[1] 30981.25

Could anybody tell me, what's going on? I suppose that

	var=sum(x^2/N)-xbar^2

or what did I enter wrong?

	Thanks

		Matej

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Matej Cepl, matej at ceplovi.cz,
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