Hi all, first of all thank you for this powerful und useful piece of software, its great! Now I have a little question: I have a time series variable p and want to creat a new variable called r with the exponential moving average of p, so r = \alpha*r_{t-1}+(1-\alpha)*p_{t-1}. Any idea how to create this r? Thanks a lot. -- Mag. Johannes Fichtinger Institute for Production Management Vienna University of Economics and Business Administration Nordbergstr. 15 UZA IV, 3. Stock, Kern A A-1090 Wien Austria Tel.: +43/(0)1-31336-5626 Mail: Johannes.Fichtinger(a)wu-wien.ac.at Web: http://prodman.wu-wien.ac.at