definition of coef.cumulative time series regression what is the difference between cumulative and total time series regression? how to model trend change in interrupted regression what is the relationship between level change and trending in rn time series how is the cumulative intervention used in time series which variable is used to describe a cumulative time series regression how to find trends in an interrupted regression what is the difference between a cumulative and a cumulative intervention in an interrupted time series? what is level trend in intervals for time series regression what is the difference between the cumulative and the level change in the interrupted period? how to explain trend change how to show a cumulative time series regression model why is trend change in interrupted time series regression important what is the correlation between level change and trend change what is the correlation between level change and trend change in an interrupted time series regression? what is the correlation between the level of intervention and the trend change in the interrupted time series regression what is the difference between an intervention and a cumulative intervention what is the difference between y and coef what is the underlying interest in the y-series what is the difference between an intervention and a cumulative intervention?