the smaller the portfolio, the less insightful the results will be. What portfolios are they wanting you to do a RA on? Auto, Helocs, etc?
You can run an OLS regression analysis in excel if you have time to learn. It is definitely one of the higher functions and kind of a pain though. If not, outsource it. They cant require you do an RA internally. If they truly want an accurate RA which identifies outliers for review than they should be happy you're willing to shell out thousands of dollars to pay an expert to run the analysis. On another note, it can take weeks to get this done on a single portfolio (vendor management, gathering data, sending data, waiting on them to run report, reviewing the data, and THEN reviewing all of the outliers identified to identify any fair lending issues). By the time you write your final report it could be a couple of months!
Out of curiosity, how big are you? How many loans in each portfolio are you looking to run an RA on?
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The opinions expressed are mine, do not represent the opinions of my employer, and they are not to be taken as legal advice.