I think it used to be "default" in denzo/scalepack. Or perhaps it was used to calculate statistics, but not to exclude reflections...I do remember having to "switch it off".
On 14 Nov 2013, at 12:29, Phil Evans wrote: > Always deprecated, hopefully never common! > > > > On 14 Nov 2013, at 11:27, Mark J van Raaij <[email protected]> wrote: > >> It used to be common to only include reflections for which I > x sigma(I) in >> refinement, with x often being 3. >> However, nowadays this is not considered good practise, as reflections with >> small Is are likely to have I < 3 sigma(I), but are also important for >> refinement. >> >> In small molecule crystallography I think it is still common to have a sigma >> criterion. >> >> if, in this respect, you have used default settings in data reduction and >> refinement, you should select "none" or "n.a." in the deposition process. >> >> Mark J van Raaij >> Lab 20B >> Dpto de Estructura de Macromoleculas >> Centro Nacional de Biotecnologia - CSIC >> c/Darwin 3 >> E-28049 Madrid, Spain >> tel. (+34) 91 585 4616 >> http://www.cnb.csic.es/~mjvanraaij >> >> >> >> >> >> On 14 Nov 2013, at 12:06, Faisal Tarique wrote: >> >>> Dear all >>> >>> I request you to please explain the "Observed criterion sigma" value >>> required during pdb deposition. Does it depends on the methods of data >>> integration and scaling ? if yes then what are the values for the data >>> processed through scalepack2mtz (HKL2000) and scala (mosflm).. >>> >>> -- >>> Regards >>> >>> Faisal >>> School of Life Sciences >>> JNU
