Re: [ccp4bb] Always Modelling Anomalous Signal

2012-01-10 Thread Ethan Merritt
On Tuesday, January 10, 2012 02:46:21 pm Ian Tickle wrote: > Jacob, > > Actually the R factors including the Bijvoet pairs would be higher, > because the uncertainties in F(+) and F(-) are higher than that of > F(mean) by a factor of about sqrt(2). R factors will always be higher > for unmerged d

Re: [ccp4bb] Always Modelling Anomalous Signal

2012-01-10 Thread Ian Tickle
Jacob, Actually the R factors including the Bijvoet pairs would be higher, because the uncertainties in F(+) and F(-) are higher than that of F(mean) by a factor of about sqrt(2). R factors will always be higher for unmerged data because averaging always reduces the uncertainty. This means that w

Re: [ccp4bb] Always Modelling Anomalous Signal

2012-01-10 Thread Felix Frolow
On Jan 10, 2012, at 22:00 , Jacob Keller wrote: > Dear Crystallographers, > > it seems to me that on a certain level we are always throwing away > (sort of) about half of our data when we merge Bijvoet pairs--why Who "We" ? > shouldn't we keep them separate, since we know that they should be

[ccp4bb] Always Modelling Anomalous Signal

2012-01-10 Thread Jacob Keller
Dear Crystallographers, it seems to me that on a certain level we are always throwing away (sort of) about half of our data when we merge Bijvoet pairs--why shouldn't we keep them separate, since we know that they should be a little bit different, especially in light of the higher multiplicities w