Programming the statistical procedures from SAS

How to sum a variable by group when a variable is to be estimated along with other parameters in a proc model?

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How to sum a variable by group when a variable is to be estimated along with other parameters in a proc model?

I want to estimate a system of equations using FIML. There are some variables that need to be summed by group. However, these variables do not exist within the data set and need to be estimated along with other parameters from the model. I would be grateful if you could let me know how to do this.

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