search for: mesure0

...are in a data frame, especially when adding xreg, would be much easier if the arima function contained 1) a "data=" argument 2) the possibility to include the covariate(s) in a formula style. Ideally the call could be something like > arima(symptome, order=c(1,0,0), xreg=~trait01*mesure0, data=anxiete) ( or arima(symptome~trait01*mesure0, order=c(1,0,0), data=anxiete) ) instead of present: > anxiete$interact = anxiete$trait01*anxiete$mesure0 > arima(anxiete$symptome, order=c(1,0,0), xreg=anxiete[, c("trait01", "mesure0", "interact")])...