CIRCSTAT: Stata modules to calculate circular statistics
Nicholas J. Cox
circstat.zip contains some Stata programs for circular statistics. Circular data are here compass or other directions, usually measured in degrees from North or some other reference direction. The fact that 0 degrees and 360 degrees are identical, so that for example 180 degrees is not a sensible mean of 1 deg and 359 deg, provides one illustration that some special statistical methods are required for analysis of circular data. There are 15 programs, each with its own help file, together with a overall help file circstat. New features, January 1999: circsumm has been extended to include a confidence interval option. circksm has been renamed circxsm. There is a new circysm. A bug has been corrected in circdplt and circrplt. circsumm has an extra option. There is a new circcomp. circhist with the histplot option depends on previous installation of histplot, barplot and genfreq, all posted on this list. circysm depends on _gatan2, ditto.
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