Tim,
r-free flags are used to calculate maximum-likelihood parameters (sigmaa,
or alpha/beta - depending on parameterization), as well as m and D in
2mFo-DFc and mFo-DFc maps. For this they are supposed to be evenly
distributed across resolution range, and the number of flags per thin
enough resol
--- Original message
> From: Robbie Joosten
> Date:
> To: CCP4BB@JISCMAIL.AC.UK
> Subject: Re: [ccp4bb] Rfree reflections
>
>
> Hi Tim,
>
> The derivation of sigma(Rw-free) is in this paper: Acta Cryst. (2000). D56,
> 442-450. Tickle et al.
> Note
: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] Rfree reflections
Hi Tim,
The derivation of sigma(Rw-free) is in this paper: Acta Cryst. (2000). D56,
442-450. Tickle et al.
Note the difference between the sigma of weighted/generalized/Hamilton
R-free and that of the 'regular' R-free (th
m: CCP4 bulletin board [mailto:CCP4BB@JISCMAIL.AC.UK] On Behalf Of
> Tim Gruene
> Sent: Tuesday, March 26, 2013 11:05
> To: CCP4BB@JISCMAIL.AC.UK
> Subject: Re: [ccp4bb] Rfree reflections
>
> Hi Robbie,
>
> thank you for the explanation. Heinz Gut and Michael Hadders po
ons.
>
> HTH,
> Robbie
>
> > -Original Message-
> > From: CCP4 bulletin board [mailto:CCP4BB@JISCMAIL.AC.UK] On Behalf Of
> > Tim Gruene
> > Sent: Tuesday, March 26, 2013 09:33
> > To: CCP4BB@JISCMAIL.AC.UK
> > Subject: [ccp4bb] Rfree
al Message-
> From: CCP4 bulletin board [mailto:CCP4BB@JISCMAIL.AC.UK] On Behalf Of
> Tim Gruene
> Sent: Tuesday, March 26, 2013 09:33
> To: CCP4BB@JISCMAIL.AC.UK
> Subject: [ccp4bb] Rfree reflections
>
> Dear all,
>
> I recall that the set of Rfree reflections should b
Dear all,
I recall that the set of Rfree reflections should be 500-1000, rather than
5-10%, but I cannot find the reference for it (maybe Ian Tickle?).
I would therefore like to be confirmed or corrected:
Is there an absolute number required for Rfree to be significant, i.e. 500-1000
irrespectiv
