Regression by a grouping variable

This macro performs a regression analysis of Y on X.1 - X.n for each level of a grouping variable.

Download the Macro

Be sure that Minitab knows where to find your downloaded macro. Choose File > Options > General. Under Macro location browse to the location where you save macro files.

Important

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Download BYREG.mac

Required Inputs

A column of dependent values
One or more columns of independent, continuous predictor variables
A column of grouping values

Running the Macro

Suppose the dependent variable (Y) is in C2, the independent predictor variables (X's) are in C3 - C8, and the grouping variable is C10. To run the macro, choose View > Command Line/History and type:

%BYREG C2 C3 - C8 C10

Click Run.

Note

The last column listed is assumed to be the grouping variable. The macro will skip any group that does not have at least p + 2 observations where p is the number of independent predictor variables.