1. A computer-implemented method for estimating a value of a transaction-based variable for credit line management comprising: providing a model for expected future profit that includes a transaction risk score that is controlled by a line increase decision strategy; analyzing pooled data that capture a variety of line increases and identify account behavior before and after a line increase; estimating future profit using models that include and exclude transaction risk score as a data source respectively; and computing the profit difference, the profit difference comprising an estimate of the value created by inclusion of the transaction-based variable.