Dason wins

#1
Me on another board "I would use R not excel. I am not very confident of excel for any but descriptive statistics. R will do any statistic you are likely wanting to do. What are you really trying to do, predict, or see the impact of one of the dummies? If you are predicting just use ARIMA or exponential smoothing which are in the forecasting and smooth modules."

Not that I will ever be great at R :)