What is the purpose of the 'whereTable' subparameter in 'modelTable'?

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The 'whereTable' subparameter in 'modelTable' specifies an input table whose rows are used as a WHERE filter for the model data. If the 'vars' subparameter is not specified for 'whereTable', all common variable names between the input table and the filtering table are used for matching rows. This filter is applied first if a 'where' expression is also provided for 'modelTable'.
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forestCode

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How is data subsetting performed on the 'modelTable' using the 'where' subparameter? What does the 'nTree' parameter define in the 'forestCode' action? How do you specify the caslib for the input model table using the 'caslib' subparameter? What is the function of the 'computedOnDemand' subparameter in 'modelTable'? What does the 'importOptions' subparameter define for 'modelTable'?
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