Hi, I have just discovered gretl. It is quite convenient that insignificant regressors can be sequentially dropped from a regression. However, sometimes want does not want to drop certain regressors right away, even if they are insignificant (e.g. variables in levels in an unrestricted error correction model). Is it possible to exclude some variables from the routine? How? Best wishes, Till -- Jetzt kostenlos herunterladen: Internet Explorer 8 und Mozilla Firefox 3 - sicherer, schneller und einfacher! http://portal.gmx.net/de/go/chbrowser