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Mar 6, 2009 9:01 AM
(752 views)

In the old days, in building a multiple regression that used "dummy variables," we'd simply specify the dummy (1 if true, 0 if false) and chuck it into the fit command. The results would then include estimates for both the regular variables and the dummy. So e.g., if there are three variables -- PRICE, SQUARE-FOOTAGE, FOR-SALE, where FOR-SALE means the house is currently for sale, and is a 1/0 dummy, you'd dump all three into the calculation, and the equation would be something like Y = a + b*SQUARE-FOOTAGE + c*FOR-SALE + e.

When I try to use the Fit Model to do this, however, I can't seem to get the model to include an estimate for the dummy. It gives me an equation with out the dummy, and then a separate graph/statistics for the dummy. There must be something very simply I'm missing here. I'd be grateful for a hint.

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Apr 14, 2009 3:55 PM
(741 views)

I am new to SAS so I am not sure how helpful I can be but have you tried putting For-Sale into a class statement? I don't think you even need to code it as a dummy variable then.

ie. before your model statement put:

Class For-Sale;

cheers,

Shmea

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Apr 14, 2009 4:38 PM
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Apr 15, 2009 5:29 AM
(741 views)