[EMAIL PROTECTED] (MMMM) wrote in message news:<[EMAIL PROTECTED]>... > > I'm looking for methods of testing differences in distributions > between groups scored on an ordinal scale. > > I have 4 groups of subjects scored daily for 72 days on a 1-7 scale. > I would like to see whether there is a difference between groups in > terms of the maximum score achieved over these 72 days. I have taken > the maximum score for each subject and created a crosstab table. > (Counts of max. score by group.) > > Since the data are ordinal, I used Mantel-Haenszel measurements for > general association as opposed to simply the Chi-Square value. I > found that there is an association between maximum score achieved and > group membership. > > I would now like to determine which groups are statistically > different, and which are not. I'm looking for a way to compare these > groups in a method similar to a multiple comparisons method that you > would do for an ANOVA. E.G. I found they're different, now which ones > are different? However, I'm having difficulty finding any way to do > this.
If your're looking for location differences then the current best ordinal comparison of two independent groups is given by eq 5.12, p 140, in Norm Cliff's 1996 book Ordinal Methods for Behavioral Data Analysis. For a corroborating opinion, see the comments re FPC3 on p 500 of H.Delaney & A.Vargha, Comparing several robust tests of stochastic equality with ordinally scaled variables and small to moderate sized samples, Psychological Methods, 7 (2002), 485-503. Use Bonferroni-based critical-p adjustments to deal with multiple tests. . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
