Abstract
The aim of this paper is to describe the SWOV-program WPM (`Weighted Poisson Methods' De Leeuw, 1975; De Leeuw & Oppe, 1976, Oppe, 1981, 1992, 1993), to compare it with the well-known SAS-GENMOD (SAS-STAT Software, 1993) procedure and to define WPM in terms of a SAS-GENMOD procedure. Technical issues are raised that have to do with methodological differences between the two procedures. Technical points, data, calculations, results and SAS-setups are treated in Appendices.