lag in a regression definition when to use lag in linear regression how long would a regression model lag what is the lag between visits in a regression model? what is four month lag how can i use the four month lag how to lag variables in a linear model what is a typical four month lag why should linear regression be lag lag in regression model definition what model is lag how to use a four month lag regression model how to calculate four month lag? what is lag in a regression? why do we need four-month lag? what does lagging mean in regression? what is the lag for predicting the sales why use four month lag? how to lag four months in a regression what is the lag in the monthly visits