Hi Gong, It is difficult to come with a diagnostic without having your histogram. Could you send me a small file with your histogram + a script with your fit funnction? Rene Brun Datao Gong wrote: > > Hi,Rooters, > I fit my ntuple with likelihood method. I found if i tightly cut, > the fit result is much different and fit quality worse (ch2/ndf far > away from 1). Compare to min_fit, i found it is from the empty bins > in histogram. Likelihood method seems do not take into account > empty bin default. (I read Burn's email in roottalk02). In my case, > I fit my histogram with option "EMVL0", the ch2/ndf is 237/189, meanwhile, > mn_fit give me 190/191. I know there are two empty bins in my histogram. > If i set "W" option, the chi2/ndf is up to 3067/191. Is there something > wrong? > > Gong Datao
This archive was generated by hypermail 2b29 : Thu Jan 01 2004 - 17:50:09 MET