Title: RE: About zero counts etc.
Hi Bill
Excellent, thank you, I am surprised that I understand
what you are saying for a change.
In other words instead of squaring some function F^2 to
minimize on you instead simply minimize on a more general function G. Its the
squaring that leads to
Title: RE: About zero counts etc.
Hi Alan,
The short answer is that the question of zero counts can indeed be answered in a simple and practical manner. There's a lot of apparent mystique about probability theory especially when one invokes the term Bayesian probability theory. Ho
Alan
From: David, WIF (Bill) [mailto:[EMAIL PROTECTED]
Sent: Thursday, 12 October 2006 4:48 PM
To: rietveld_l@ill.fr
Subject: RE: About zero counts etc.
Dear all,
Jon's right - when the counts are very low - i.e. zeroes and ones around -
then the correct Bayesian appr
Title: RE: About zero counts etc.
Dear all,
Jon's right - when the counts are very low - i.e. zeroes and ones around - then the correct Bayesian approach is to use Poisson statistics. This, as Jon said, has been tackled by Antoniadis et al. (Acta Cryst. (1990). A46, 692-711 Ma
Hello Joerg,
> -Having measured n counts, the estimated value is n+1
You might have a hard time convincing me on that one.
> -Having measured n counts, the esd is also sqrt(n+1)!
If n is zero then spending more time on the data collection might be better than
more time on the analysis.
> Thing
Hi all,
from time to time, the problem of zero values in the pattern
is discussed. I have done an indepth Bayesian approach:
Have assumed identical probability of all values prior to
measurement and have calculated the Bayesian distribution
of probabilities after having measured n counts, its est
