
Accession Number : AD0744644
Title : On Sensitive Rank Tests for Comparing the Effects of Two Treatments on a Single Group.
Descriptive Note : Technical rept.,
Corporate Author : STANFORD UNIV CALIF DEPT OF STATISTICS
Personal Author(s) : Ury,Hans K.
Report Date : 16 JUN 1972
Pagination or Media Count : 32
Abstract : The rank test R sub n of Cronholm and Revusky (1965) in effect doubles the number of comparisons carried out in the MannWhitney test between 'Treated' and 'Control' subjects chosen from a single group of n and triples the asymptotic efficiency against shift alternatives by using a series of n1 subexperiments. However, the full series can be too costly or timeconsuming. It is shown that j appropriately chosen subexperiments will permit one to make at least j/(j+1) of the number of comparisons possible under R sub n with large sample efficiency of j/(j+2) relative to R sub n against shift alternatives and small sample efficiency greater than that, j = 2 3,...,n2. The resulting test criterion is a sum of j independent MannWhitney test statistics. Its null distribution is tabulated for < or = 10 and j < or = n/2, and small sample efficiency comparisons are carried out for n = 10. (Author)
Descriptors : (*STATISTICAL TESTS, DISTRIBUTION FUNCTIONS), SAMPLING, RANDOM VARIABLES, ASYMPTOTIC SERIES, TABLES(DATA)
Subject Categories : Statistics and Probability
Distribution Statement : APPROVED FOR PUBLIC RELEASE