[Ifeffit] Inconsistency of the amplitude reduction factor

[HOON Kim]

Dear Bruce,
Good point ! I will keep it in mind. (error bars were like +/- 0.05677..)
Kind Regards,HOON
> Date: Thu, 18 Sep 2014 09:11:03 -0400
> From: bravel at bnl.gov
> To: ifeffit at millenia.cars.aps.anl.gov
> Subject: Re: [Ifeffit] Inconsistency of the amplitude reduction factor
> 
> On 09/18/2014 08:20 AM, HOON Kim wrote:
> > I'd like to be more specific about my obtained results,
> >
> > At reference state (that means without any applied current), the
> > amplitude reduction factor was 0.77
> > At 20% charge, it was 0.67
> > 40% charge = 0.66
> > 60% charge = 0.63
> > 80% charge = 0.68
> > full charge = 0.67
> 
> My other comment on this thread is that you are not being specific 
> enough.  Without error bars, it is not possible to interpret those 
> numbers in any physically meaningful way.  Similarly, without knowing 
> the uncertainty, it is hard for us to comment substantively on your 
> question.
> 
> I would imagine that, given the likely size of your error bars, 0.63 and 
> 0.68 are not different results.  In fact, it is possible that 0.63 and 
> 0.77 are not different in any defensible way.  That may be yet more 
> likely given the possibility of systematic error due to changes in 
> morphology -- which would not be properly captured in the statistical 
> error bars --  as I mentioned in my last post.
> 
> Remember: ALWAYS cite error bars with numbers from a fit!
> 
> B
> 
> 
> -- 
>   Bruce Ravel  ------------------------------------ bravel at bnl.gov
> 
>   National Institute of Standards and Technology
>   Synchrotron Science Group at NSLS --- Beamlines U7A, X24A, X23A2
>   Building 535A
>   Upton NY, 11973
> 
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