Dear R-helpers, currently I am writing a thesis using R in forecasting scenarios. No the time is shortening and I wanted to set up all test cases, including the STLF algorithm of the forecast package. I am using 15 minutes (96 a day) data of two weeks to forecast one week... The frequency used is 672 (so two weeks) This should be fine because it has to be at least 2 priods.. Unfortunately the stlf algorithm claims that my time series is "not periodic or has less than two periods" . But both is definitely true... If I add one more value it works but this would falsen the forecast and lead to more problems since I use different granularities and had to add 8 more values in the worst case.... I have this problem only with the stlf algorithm. Holt Winters and other ones work perfectly... Do you know any solution for this problem? A fast answer would be really great because I am very close to the release of my work for my university Kind regards and thanks in advance Christian Ihr WEB.DE Postfach immer dabei: die kostenlose WEB.DE Mail App f?r iPhone und Android. [1]https://produkte.web.de/freemail_mobile_startseite/ References 1. https://produkte.web.de/freemail_mobile_startseite/