The standard linear regression model does not ... and the base case.) Example: To include automobile-make (with the values Ford, Honda, BMW, and Sterling) in the maintenance-and-repair-cost model, ...

However, with time series data, the ordinary regression residuals usually are correlated over time. It is not desirable to use ordinary regression analysis for time series data since the assumptions ...

At times it is desirable to have independent variables in the model that are qualitative rather than quantitative. This is easily handled in a regression framework ... the precision of the analysis.