... although this raises a question: if there are no free reflections,
then why is a "Rfree" score being reported at all?
On 2019-08-30 16:53, Christian Roth wrote:
No. As pointed out by Pavel, there are no reflections flagged as
"free reflections" used to calculate Rfree. Therefore you don't get a
real Rfree. No model bias issue etc. If you have a Rfree using ccp4
programs, than you should used that particular original mtz in phenix.
It should detect the flagged "free reflections" automatically.
Cheers
Christian
On Fri, Aug 30, 2019 at 5:24 PM Tung Thanh Dinh <[email protected]>
wrote:
I have been using elipsoidal truncated data all long. And at first i
couldn't find a well homologous model (50% homology is the best i
can find) so I use Mr Bump and Buccaneer to create a model to phase
and autobuild. After a lot of refinement I obtained "good" model
with good statistics. Then I used this "good" model to either phase
and autobuild again. So this may be due to the model bias?
Kindest regards,
Tung Dinh
PhD student
The University of Georgia
Department of Chemistry
-------------------------
FROM: CCP4 bulletin board <[email protected]> on behalf of Tung
Thanh Dinh <[email protected]>
SENT: Friday, August 30, 2019 9:36:58 AM
TO: [email protected] <[email protected]>
SUBJECT: [ccp4bb] I am doing phenix refinement now. Is it a problem
if the r-work and r-free values are equal?
After phasing with phenix, i clicked on the phenix.refine ribbon.
Since then for every macrocycle of refinement, r-work and r-free
values are always the same. Is this a problem that I need to fix?
Kindest regards,
Tung Dinh
PhD student
The University of Georgia
Department of Chemistry
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