how to fit different time series time series for national impact analysis why does a national policy intervention need a separate model? what kind of regression is used for interrupted time series what is the best way to analyse the impact of an intervenent? how to model the impact of a policy intervention why is it important to fit arima for the timeseries on panel data how to measure the effect of a policy intervention across state how to use interrupted time series regression how to do interrupted time series analysis how to analyze interstate time series in statistics how do you fit an arima model how to model an intervention how to analyse interstitial time series in arima how to analyse inter-state time series how do you fit a regression model for an interrupted time series how to measure interrupted time series in data set how to analyze national impact in statistics how to do an interphase analysis on interphase data what is the best way to fit arima model? how to find the correct way to do the analysis of inter-phase data?