Hello allstats -- Sometime in the last year I recall seeing some discussion about the use/abuse of linear regression using Microsoft Excel. I was recently asked if there are any excel add-ins that would allow linear regression of 40+ independent variables. Before I reply, I'd appreciate some knowledgeable comments. (BTW, I use S-Plus, so my own preference/bias should be clear) All the best, Donald C.E. Robinson [log in to unmask] ESSA Technologies Ltd Vancouver, Canada http://www.essa.com %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%