TWO STATISTICS FOR THE ANALYSIS OF ORIENTATION DATA IN GEOGRAPHY
Margaret Dale, Colin K. Ballantyne · The Professional Geographer · 1980
Two versions of the An statistic of Ajne and Stephens are introduced, explained, interpreted and evaluated. These statistics possess important advantages over those currently used by geographers for the analysis of orientation data. They are invariant with respect to the point of origin of measurements, do not assume a circular-normal distribution and are not limited by sample size. Used in conjunction, they allow the significance of direction as well as orientation to be determined.