Hola! For a more robust test, which not assumes equal centers, use the fligner-Killeen test.
Kjetil Halvorsen Glen Barnett wrote: > > Rich Ulrich <[EMAIL PROTECTED]> wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > On Sat, 09 Feb 2002 16:59:34 GMT, Johannes Fichtinger > > <[EMAIL PROTECTED]> wrote: > > > > > Dear NG! > > > I have been searching for a description of the Ansari-Bradley dispersion > test up to now for > > > analysing a psychological research. I am searching for a description of > this test, specially a > > > description how to use the test. > > > > > > Please, can you tell me, how to use the test, or show me a link, where it > is described? > > > Thank you very much in advance, > > > > I plugged Ansari-Bradley into a search by www.google.com and > > there were 287 hits. The first page contained the (aptly named) > > > > > http://franz.stat.wisc.edu/~rossini/courses/intro-nonpar/text/Specifications_fo > r_the_Ansari_Bradley_Test.html > > > > I suggest repeating the search. That also eliminates the "pasting" > > problem if your reader has broken the long URL into two lines. > > A warning, however; the Ansari-Bradley test (and similar tests like the > Seigel-Tukey) has some drawbacks: > i) it assumes the locations are identical > ii) it is less powerful than some alternative tests > > If assumption (i) is false, the A-B test may have very little power to detect a > difference in variance. > > Glen > > ================================================================= > Instructions for joining and leaving this list, remarks about the > problem of INAPPROPRIATE MESSAGES, and archives are available at > http://jse.stat.ncsu.edu/ > ================================================================= ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at http://jse.stat.ncsu.edu/ =================================================================
