Opened 9 years ago

Closed 9 years ago

#352 closed bug (fixed)

cell decay module - error on P (or mu*P)

Reported by: srkline Owned by: srkline
Priority: major Milestone: Polarization Reduction
Component: All Components Keywords:
Cc: Blocking:
Task:

Description

the error bars on P or mu*P seem to be too large, which may in turn lead to the overly-large error on the fitted gamma, which is typically 100+-100, where other calculations give +-10

Change History (3)

comment:1 Changed 9 years ago by srkline

apparently, if you don't use any error bars on P or mu*P, you get ~ 100 +/- 10 for the answer, rather than 100 +/- 100 if you use the error bars as you should.

-So what do I do?

comment:2 Changed 9 years ago by srkline

the error on mu in the fundamental cell parameters seems to be the dominant term in the error. it's about 10% now, and leads to the 10% error bars on the calculation of Polarization. If err_mu is a factor of 10 lower, then the error bars on P are reasonable, and the fit is more like 130 +/- 17. these reduced errors on Gamma then lead to reduced errors on the flipper calculations.

comment:3 Changed 9 years ago by srkline

  • Resolution set to fixed
  • Status changed from new to closed

The errors I was given as input for the fundamental cell parameters, was +/- 0.2, when in reality it is +/- 0.02... The factor of 10 lower that I need to have reasonable error bars on the decay fit to get gamma. So there is no problem with the errors...Nothing to fix except to put in proper values for the default cell constants. Will do this when Wangchun gets them to me.

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