Error in estimate and contrast statements - need help interpreting error

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Error in estimate and contrast statements - need help interpreting error

All,

I am a student and keep getting an error when setting up estimate and contrast statements. I'm trying to build a model for the association between mean glucose and exercise status, and control for possible confounding. Below is the log, and I keep getting this error message "Effects used in the ESTIMATE statement must have appeared previously in the MODEL statement." I don't understand why I keep getting this - the variables 'waist' and 'diabetes' are in the model statement. Does anyone know what I'm doing wrong/can help me out?

Thanks!

89   proc glm data=testdata1;

90   class diabetes;

91   model glucose = waist diabetes/solution;

92   estimate 'diabetes: waist = 80' diabetes 1 -1 waist*diabetes 80 -80;

ERROR: Effects used in the ESTIMATE statement must have appeared previously in the MODEL

       statement.

NOTE: The previous statement has been deleted.

93   estimate 'diabetes: waist = 110' diabetes 1 -1 waist*diabetes 110 -110;

ERROR: Effects used in the ESTIMATE statement must have appeared previously in the MODEL

       statement.

NOTE: The previous statement has been deleted.

94   estimate 'diabetes: waist = 140' diabetes 1 -1 waist*diabetes 140 -140;

ERROR: Effects used in the ESTIMATE statement must have appeared previously in the MODEL

       statement.

NOTE: The previous statement has been deleted.

95   contrast '80 vs. 90'  diabetes 1 -1 waist*diabetes 80 -80, diabetes 1 -1 waist*diabetes 90

95 ! -90;

ERROR: Effects used in the CONTRAST statement must have appeared previously in the MODEL

       statement.


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‎02-04-2013 02:17 PM
Respected Advisor
Posts: 3,799

Re: Error in estimate and contrast statements - need help interpreting error

Posted in reply to SASstudent2012

Yes the variables are there but they only define the main effects effect for each variable.  You need to include the interaction effect waist*diabetes.

you can use vertical bar
glucose = waist | diabetes;

View solution in original post


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Solution
‎02-04-2013 02:17 PM
Respected Advisor
Posts: 3,799

Re: Error in estimate and contrast statements - need help interpreting error

Posted in reply to SASstudent2012

Yes the variables are there but they only define the main effects effect for each variable.  You need to include the interaction effect waist*diabetes.

you can use vertical bar
glucose = waist | diabetes;

New Contributor
Posts: 2

Re: Error in estimate and contrast statements - need help interpreting error

Posted in reply to data_null__

Thank you. I updated that line to model glucose = waist exercise waist*exercise/solution;

It worked.

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