Accession Number : AD0648082

Title :   ESTIMATION AND TESTING PROCEDURES FOR CIRCULAR NORMALLY DISTRIBUTED DATA.

Descriptive Note : Technical rept.,

Corporate Author : NORTHWESTERN UNIV EVANSTON ILL DEPT OF GEOLOGY

Personal Author(s) : Jones,Thomas A.

Report Date : FEB 1967

Pagination or Media Count : 66

Abstract : The report examines some aspects of circular normal distributions. The analysis of such data requires methods different from those used in studying conventional linear distributions, inasmuch as choice of origin is significant. In the circular normal (Mises) distribution commonly used estimators are the vector mean and the vector strength, more fully defined in the text. Tests of preferred orientation are conducted by the Rayleigh R-test or by the Greenwood-Durand U-test. Methods for placing confidence intervals about the orientation, and testing hypotheses of specific orientations, are based on the distribution of R given U, analogous to student's t-distribution. These methods or various alternatives are applicable to data which are bimodal, concentrated over a small range, or determinable only modulo 2pi. An appendix lists a computer program for conducting various tests and estimating parameters for circular normally distributed data. Rejection criteria for the various tests are also included. (Author)

Descriptors :   (*STATISTICAL TESTS, *GEOPHYSICS), DISTRIBUTION THEORY, STATISTICAL DISTRIBUTIONS, COMPUTER PROGRAMS, STATISTICAL DATA, GLACIERS

Subject Categories : Geology, Geochemistry and Mineralogy
      Statistics and Probability

Distribution Statement : APPROVED FOR PUBLIC RELEASE