In an article entitled Diagnostic Check for Monotone Spread in Computational Statistics and Data Analysis, I discuss a general statistical test for detecting a type of variance change or heteroscedasticity that can be removed by a power transformation. Documented Splus and Fortran software is available for downloading in zipped format: slcheck.zip --- before unzipping this file, please read the installation instructions. Also you may wish to download this file: unzip.exe
09/28/01