Hi R, Seems like the maximum seasonal 'q' parameter for the ?arima is 350. Any way, where we can increase this? Since I am working on 3 year (q=252*3) and 5 year(q=252*5) returns, I may require this option. Thanks.> fit=arima(r,c(3,0,0),seasonal = list(order = c(0, 0, 500), period NA));tsdiag(fit);fit$aicError in makeARIMA(trarma[[1L]], trarma[[2L]], Delta, kappa) : maximum supported lag is 350 Thanks, Shubha This e-mail may contain confidential and/or privileged i...{{dropped:13}}