what kind of models does r use how to do a model estimate what is the model for estimating what model would be used for all of the time intervals of an ARIMA project? can you model a time series how to find a model that fits several data sets? how to estimate same model in multiple time series time series estimating how to estimate model over time series estimating a model with multiple time series predicting time series how to estimate time series how to do arima model for a data series how do you get a model of a time series when do you need to estimate models over time how to use arima how to estimate models can a rar model be used to estimate multiple time series? what model could fit multiple time series? how to estimate multiple time series