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*To*: ccp4 <ccp4bb@dl.ac.uk>*Subject*: RE: [ccp4bb]: I to F's*From*: Alexey Bochkarev <Alexey-Bochkarev@ouhsc.edu>*Date*: Tue, 14 Nov 2000 20:13:33 -0600*Sender*: owner-ccp4bb@dl.ac.uk

*** For details on how to be removed from this list visit the *** *** CCP4 home page http://www.dl.ac.uk/CCP/CCP4/main.html *** > > For example; in CNS > > > > if I >= 0 and sigI < I: > > > > F = sqrt(I) > > sigF = F - sqrt(I - sigI) > > > > if I >= 0 and sigI >= I: > > > > F = sqrt(I) > > sigF = F > > > > if I < 0: > > > > F = 0 > > sigF = 0 [Alexei Botchkarev] A rationale of such conversion in CNS is not clear for me. Starting with I + SigI = ( F + SigF ) **2 and assuming unbiased distribution: I = F**2 one can easily get: SigF = sqrt( I + SigI ) -sqrt( I ) which is valid for all I,SigI > 0 Alexey Alexey Bochkarev, Assistant Professor Dept. of Biochemistry and Molecular Biology Univ. of Oklahoma Health Sciences Center, BRC-466 P.O. Box 26901, Oklahoma City, Oklahoma 73190 Phone: (405) 271-8346 FAX : (405) 271-3910 mailto:Alexey-Bochkarev@ouhsc.edu http://xtliris.ouhsc.edu/alexey.htm >

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