[ccp4bb] Problem with getting Rfree and Rf down

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CCP4bb <-- 1999 <-- November 1999 <-- 30 November 1999

Previous message:
Subject: Building Coot with SSM
From: Dale Tronrud det102 {- at -} UOXRAY {- dot -} UOREGON {- dot -} EDU
Date: 2012-01-23

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Subject: Re: Problem with getting Rfree and Rf down
From: Ed Pozharski epozh001 {- at -} UMARYLAND {- dot -} EDU
Date: 2012-01-23

Subject: Problem with getting Rfree and Rf down
From: Sam Arnosti meisam {- dot -} nosrati {- at -} GMAIL {- dot -} COM
Date: 2012-01-23

Hi every one

I have some crystals in the space group P3121. I collect 180 frames of data.

My crystals do not diffract better than at most 2.0 angstrom, but the Rf barely goes below 23%,

and Rfree also remains somewhere between 28-33%. I have tried to refine my data as much as I can.

I do not know whether the problem is because of the bad diffraction or collecting extra frames.

The structure factors are also high but they get better as the crystals diffract better.

Thanks

Sam

CCP4bb navigation

CCP4bb <-- 1999 <-- November 1999 <-- 30 November 1999

Previous message:
Subject: Building Coot with SSM
From: Dale Tronrud det102 {- at -} UOXRAY {- dot -} UOREGON {- dot -} EDU
Date: 2012-01-23

Next message:
Subject: Re: Problem with getting Rfree and Rf down
From: Ed Pozharski epozh001 {- at -} UMARYLAND {- dot -} EDU
Date: 2012-01-23