Hi,all,
Maybe it's too simple for you, but I have been recently bothered by one problem. If only X, Y, and their standard error (SE) are known, how to calculate the SE of (X+Y), (X*Y), and (X/Y)?
Thank you in advance!
Hi Ke-Qing
You rly can't without knowing also the covariance: E((X-E(X)*(Y-E(Y)). As also Michaels reference should tell you.
cheers / Bo
Thanks, guys!
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