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This Report describes a FORTRAN computer program for evaluation of (1) the results of crystallographic least-squares refinements by examination of the residuals. (2) differences in sets of data collected by different methods from the same crystal. (3) differences in data sets collected by the same method from different crystals of the same material, and (4) the differences in parameters in different models representing the crystal structure of the same material. Part of the evaluation is accomplished by plots of residuals against the expected normal distribution quantities. Additional plots compare residuals with the independent variable. d, and with the calculated variable F(C squared)sin 2 theta. The Miller indices can be used to divide a data set into various classes and octants so that the possibility of anisotropic effects can be examined. The program will trest up to 7200 data points in each of two experimental data sets or 1000 structural parameters, and is oriented specifically towards examining crystallographic data. (Kursetz)