Hi All, I am trying to use NLIN Model (Non linear regression) using Sas guide. My model has many covariats. When using the Sas Wizard, it's written that the number of explanatory variable is limited to 1 (not sure why..). However, when trying to update the code, it allowed me to add two more covariates but when adding dozens, I get the message: 'Zero observations could be evaluated' and the model did not predict anything. Do you have any idea how to make it work? Thanks a lot in advance!
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