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Good morning to you all, Sorry for taking your time from your research and teaching schedules.   If you have a non-stationary univariate time Series data that has the transformation: Say; l.dat<-log (series) d.ldat<-diff (l.dat, differences=1) and you fit say arima model. predit.arima<-predict (fit.series, n.ahead=10, xregnew= (n+1) :( n+10)) How could I re-transform

...I can also give the client options and say, "if you go with RHEL, you're going to run into the re-occuring problem of X, Y and Z." In most cases, it helps me eliminate Microsoft from client consideration early on, but in some cases, I actually end up rolling out a completely _non-Red Hat_ solution. > You might as well try to explain to me why upgrading or installing > certain MS products require moving the whole enterprise to Active > Directory first. That's different, although the concepts are similiar. There is no vendor that can provide a solution that doesn'...