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It would be a lot less effort to use a package. SPSS has some complex sample-drawing and analysis. If you need analysis of complex samples that is not in SPSS, in my experience it has been useful to use SPSS to get the point estimates and then use that output to navigate through the output from SUDAAN or WesVar. If you really want to reinvent the wheel, many universities have IMSL from Visual Numerics. Hope this helps. Art [log in to unmask] Social Research Consultants University Park, MD USA (301) 864-5570 Stefano Sofia wrote: >Hello. >This is not the right mailing list for this kind of requests, but likely I >will get useful information. >I need to start programming in Fortran. Before starting it I need to know >whether there are already subroutines or functions for sampling values from a >univariate and multivariate Normal distribution. >I have been looking in the web, I found functions for sampling from N(0,1). >Nothing about multivariate distributions. Does anyone have what I am looking >for, or know where to get it? > >thank you for the eventual help >Stefano > > >