# Journal of Applied Crystallography

### Volume 46, Part 5 (October 2013)

## computer programs

*J. Appl. Cryst.* (2013). **46**, 1521-1522 [ doi:10.1107/S0021889813021390 ]

*INSTAT*: a program for computing non-ideal probability density functions of |*E*|

**Abstract:** The purpose of this program is to evaluate probability density functions (p.d.f.s) of the magnitude of the normalized structure factor |*E*| for the space groups of the triclinic, monoclinic and orthorhombic systems, and for any chemical composition of the asymmetric unit, assuming that the atoms are located in general positions. The p.d.f.s are computed by the Fourier and Fourier-Bessel methods [see *e.g.* Shmueli (2012). *J. Appl. Cryst.* **45**, 389-392]. The p.d.f.s evaluated are scaled together with the histogram of observed |*E*| values and discrepancy criteria are computed. In addition to the above non-ideal p.d.f.s, the ideal p.d.f.s [Wilson (1949). *J. Appl. Cryst.* **2**, 318-321] are also computed and prepared for comparison with an experimental histogram.

**Keywords: probability density functions; ***INSTAT*; computer programs.

**Notes:**To open or display or play some files, you may need to set your browser up to use the appropriate software. See the full list of file types for an explanation of the different file types and their related mime types and, where available links to sites from where the appropriate software may be obtained.

The download button will force most browsers to prompt for a file name to store the data on your hard disk.

Where possible, images are represented by thumbnails.

Copyright © International Union of Crystallography

*IUCr Webmaster*