Re: Error Bars

From: Rene Brun <>
Date: Sun, 29 Oct 2006 06:29:07 +0100 (MET)

see TGraphAsymmErrors::BayesDivide

This function computes the asymmetric errors from the division of two histograms.

Rene Brun

Sat, 28 Oct 2006, Quintessence wrote:

> Hello,
> My lab group is trying to calculate asymmetric error bars for our Cosmic Ray
> experiment (the data analysis is becoming more complex than obtaining the
> data). We need to calculate asymmetric error bars for our efficiency
> calculations, but we could not find a ROOT macro for this. Our professor
> wishes for us to use the result of Dr. Marc Paterno's May 2003 paper on Error
> Analysis to calculate the error. Unfortunately the "macros" are a series of
> .hpp and .cpp files that do not run in either a Windows/Linux command terminal
> or either corresponding version of ROOT. We have had slightly more success by
> downloading a series of GSL library routines for the terminal, however it
> still does not run properly and our professor has made it clear we are to use
> ROOT. While we have figured out how to plot the assym. error bars, are there
> any ROOT macros available to actually calculate them?
> Thank you,
> -Quintessence Anx
Received on Sun Oct 29 2006 - 06:29:13 MET

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