The use of regression analysis for forecasting sales always requires the existence of some sort of sales history.

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Regression analysis is a statistical method used to model the relationship between a dependent variable and one or more independent variables. Therefore, it requires data for both the dependent and independent variables. In the case of forecasting sales, the dependent variable would be sales, and the independent variables would be factors that impact sales such as advertising spend, seasonality, or economic indicators. Sales history is necessary to create a model and make accurate predictions about future sales.

The Use of Regression Analysis for Forecasting Sales Always Requires