Truncate doesn't alter the intensities, except by an arbitrary scale
factor. What it does is estimate |F|
But it does produce some useful statistics
Phil
On 10 Nov 2008, at 13:09, James Whittle wrote:
>>
>
> Dear ccp4ers,
>
> I hope you won't mind revisiting more twinning questions, but this
> thread has me considering whether I have treated some recently
> collected, most likely twinned, data in the best way.
>
> Last week I was told that I ought to let phenix.refine choose freeR
> flags for twinned data, as that program takes into account twinning
> in choosing the set. Is it then better to provide the intensities
> (as a scalepack file) directly to phenix.refine, or is scaling them
> with TRUNCATE still good practice?
>
> My initial thought was that the difference between using TRUNCATE or
> not would be marginal, but perhaps in the case of twinned data it is
> better to skip that step?
>
> Please excuse me for bringing up twinning again, as there seems
> already to be disproportionate coverage of it on the bulletin board...
>
> --James
>
>>
>> on the experimental sigma(I). This enables all the data to be
>> used and facilitates the refinement of twinned structures.
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