Here is the actual Prosper Standing Order Analyzer that I use when evaluating standing order loan rates. For input it takes the high and low debt to income ratio as well as the high and low loan amount. It looks at all loans in the last 100 days with low DTI 0% to high DTI, and low loan amount to high loan amount. It returns a graph of the average interest rate by credit grade and calculates the number of loans, average amount borrowed, weighted average interest rate by amount borrowed, and the standard deviation of the interest rate. Give it a try.