Input an annual, quarterly series. Create a quarterly or monthly series via ARIMA
disag1(x, m)
Disag. series to be summed
Disag. series mean
Disagg phi value
Disagg theta value
Disagg sigma2
Input ts, must have frequency of 1 or 4
Order of disaggregation, must be 12, 4, or 3
Uses ARIMA model on the aggregate series to create a disaggregate series
William W.S. Wei and Daniel Stram, 1990, Disaggregation of Time Series Models, Journal of the Royal Statistics Society, B, Vol 52, Number 3, pp. 453-467. Erin M. Hodgess and William W.S. Wei, 1996, Temporal Disaggregation of Time Series, Applied Statistical Science I, pp. 33-43, Nova Science Publishers, Commack, NY