Hi, May be I misunderstood your question, but the answer is RMS/sqrt(entries) In ROOT terminology, if you have an histogram h, you can do: Double_t err = h->GetRMS()/TMath::Sqrt(h->GetEntries()); Rene Brun Zhou Zhang wrote: > > Hi rooters, > > I have a 1D histogram. I need to get the error of the mean of the > histogram. Who knows how to do it? > > Thanks, > > zhangz
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