Thanks for your answer. But I dont understand, Can you be more specific? here is the data for example - volume , day_in_week, day_in_month, month 1200,1,24,11 801,4,31,7 600,7,5,2 When I use Proc GLM it gave me beta estimatores for dummi variables so it is already include the volume my line looks like this where X1=X2=X3=1 Y= intercept+ b1*X1+b2*X2+b3*X3 So I cannot user the beta estimatores as precentage. What proc will out[ut the bet's as a precentage and not as a number of volume. Thanks
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