hi sir, I'm starting on statistics and I'd like to know if you could clarify for me the difference between a time series model (AR(p) for example) and a regular regression model? is a AR(p) the same as a regression model having the lag(p) variables as predictors? ie: Y(t) = a + b1 Y(t-1) + ... +bP Y(t-p) + error? And what would be a good start point for this subject combined to R? thank you very much, aished ____________________________________________________________________________________ Comedy with an Edge to see what's on, when.