hi i only need help to get the frequency or an factor which describe if a time series is a high or low frequency time series. is their an simple methode to calculate a factor or an test which gives some information if the time seriese have much peaks or if the time series have a harmonic design... for information i have tried a periodogram but it only shows the value of the periode in which the series have the same design, but i need to now if it is high or low frequency? thanks for help! best regards... Der WEB.DE SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen! *http://smartsurfer.web.de/?mc=100071&distributionid=000000000066* [http://smartsurfer.web.de/?mc=100071&distributionid=000000000066] [[alternative HTML version deleted]]