I cant answer for cphasematch but I believe it uses a resolution dependent phase analysis discussed by Woolfson and Lunin in the 1980s and similar to the method used to calculate the MAPCC used in SHELXE That checks for a possible origin shift as well as analysing difference - but I presume you have no origin shift? PHISTATS documentation describes what it does: First phase differences are corrected for differences of nPI to always lie between -180 and +180 It outputs: <Phase_diff> CC of phase_diff with W1 and W2 CC of cos(phi_diff) with W1 and W2 Eleanor 1) James Tucker Swindell II wrote: > I am currently working with two of ccp4i's phase comparison software > packages, Phase Comparison(a clipper utility) and Phistats. I am > having a problem finding information concerning both how the programs > actaully analyze the data (since I find slightly different results > with each program) and finding documentation concerning the labeling > of the columns in the output log files. > > In Phase Comparison I am using phase/weight(phi/tom) > > In Phistat I am using > PHIBP = PHIC WP = FOM > PHIB2 = PHIB. W2 = FOMM > > Both results are very close buy I am intersted in what algorithmis > being used in each, perhaps not to technical but enough to truly > understand what each program is doing and it's corresponding output. > > Any assistance would be appreciated > > James Tucker Swindell II > Ph.D. Candidate, Physics > Research: > Department of Biochemistry and Molecular Biology > University of Georgia > B202 Davison Life Sciences Bldg. > 1057 East Green St. > Athens Ga, 30605 > Lab: 1(706)-542-2913 > Direct: 1(706)-247-5220 > Fax: 1(706)-542-3077 > [log in to unmask] > >