[RMCProfile-users] Weighting of data sets

[Henrik Mauroy]

Hi everyone.
This might be a dumb question but I wonder how the weighting of the data 
sets are done. So far I've used equal weighting for G(r), F(Q) and Bragg 
and haven't been troubled by this yet.
I have some data collected at GEM where the Bragg data is completely 
impossible to fit due to a unusually weak Bragg signal (due to 
cancelling negative scattering lengths), and need to turn the weighting 
of the Bragg data to such a low number that it is not being part of the 
fitting.

1) What effect does a higher number for the weight do?
2) In what range should the weight-number be? In most examples it is 
smaller than 0.1, but can you use bigger or smaller numbers?
3) I see from experimenting with high and low numbers that the chi^2 
value calculated for the data set in question becomes larger for a lower 
weighting. Is this the number RMCProfile is trying to reduce?

Thanks for any answer!

Cheers,
Henrik