Recall that a multiplicative model is additive in the log space. Consequently, procedures such as GENMOD, GEE, GLIMMIX, HPGENSELECT and TRANSREG in SAS/STAT, and X11, X13, ESM and ARIMA in SAS/ETS can be used to fit multiplicative models. You should look through some of the worked examples in the documentation to see which might fit your needs.
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Learn the difference between classical and Bayesian statistical approaches and see a few PROC examples to perform Bayesian analysis in this video.
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