[Eg6_analysis] DC calibration issues

[Stepan Stepanyan]

Hi Seema,

Thanks for looking into this. I do not think initial
setting of parameters will effect much. In user_ana
"B" in the fitting option and "0" for number of parameters
means that initial value of parameters are recalculated.
The straight forward check is to fit the same histogram
with both settings and see if there is a difference.
You can take one of histograms from cooked monitoring
histograms and fit with settings in dc3.

Stepan


On 12/5/10 5:01 PM, seema at jlab.org wrote:
> Hello Everyone,
> I have checked once again the fitting function used in dc3  and user_ana
> software. Although double gaussian is used in each case but the starting
> parameters are not allowed to vary freely in user_ana and that may be the
> reason for inconsistency in time residual means.
>
> Functional form used in user_ana
>
> call hfithn(hid,'G+G','QB',0,ggpar,step,pmin,pmax,eggpar,chi2)
> ggpar(1) = 50000
> ggpar(2) = 0.
> ggpar(3) = 0.02
> ggpar(4) = 10000
> ggpar(5) = 0.
> ggpar(6) = 0.1
>
> Functional form used in dc3
>
> hfithn(HID,"g+g","Q",6,PAR,STEP,PMIN,PMAX,SIGPAR,&CHISQ);
>
> PAR[6] = {500.0, 0.0, 0.0300, 50.0, 0.0, 0.100}
>
> Please notice the extra  'B' option selected in user_ana and also the
> starting parameters are different!
>
> Best regards,
> Seema
>
>
>> Dear all,
>>
>> due to various activities, Hall closing, PAC deadline and so on,
>> tomorrow's eg6 meeting is canceled.
>>
>> Stepan
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