英文文献：The Measurement Of Structural Variation Over Time: The Case For Advertising And Food Demand
英文文献作者：Ward, R.W.,Myers, L.H.
英文文献摘要：
A distributed lagged advertising model with coefficients having random and systematic adjustments was estimated. The paths of parameter adjustments clearly identify structural changes in advertising effectiveness and price responsiveness. The model is used to show improvements over fixed models for forecasting.