Category: Topics in Data Science

Bayesian Improved Surname Geocoding (BISG) Race Predictor

Ab N'DiayeLeave a comment

The Bayesian Improved Surname Geocoding (BISG), is used by the CFPB to determine race and ethnicity proxies. In recent years the algorithm has been used to determine alleged discrimination at auto finance companies, including an $80 million dollar fine for a well-known bank. This method is far from perfect. For example, someone’s ascribed probabilities can change due to marriage or change of residence.

I created the prototype of a calculator using R/Shinydashboard available at https://pabdndiaye.shinyapps.io/bisg_shiny/ for readers to play with. It takes as inputs: ‘name’ and ‘zip code’ and ascribes the probabilities of that person being of various races and ethnicities using the Bayes rule.

 

One Data Scientist’s Primitive Approach to Analyzing the SunTrust – BB&T Merger

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Recently when I heard that SunTrust and BB&T merged, I casually wondered about the footprint of the combined bank. Although the number of branches is not necessarily an indicator of the health or performance of a bank, there are benefits to customers of having brick and mortar branches of commercial banks. A few of these include:

  • Readily available ATMs to help in cash withdrawals
  • Customers’ ability to transact large cash withdrawals
  • More robust banking relationships as customers tend to more readily trust banks with branches they can walk into
  • Human contact to answer money-related questions

Quite often, a data scientist’s job is to summarize and communicate information in a clear and concise manner. We’ve all heard the phrase, “a map is worth a thousand words”, and with good reason. Maps are easy to interpret, they are nice to look at and they give us context without having to use too many words. In that same spirit, below we present some maps highlighting the geographic coverage of SunTrust, BB&T and that of the combined entities. A visual approach seems to be a rather pleasing way to allow an audience to rapidly understand the raw location data.

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Machine Learning and Credit Risk (part 2) – Credit Cycle Method

Ab N'DiayeLeave a comment

The canonical method to forecasting a credit migration matrix is an econometric model: the one factor approach described in Belkin et al. (1998). This approach suggests that one might consider an approach to condition migration (transition) matrices by creating a systematic component which represents the “credit cycle” that relates the economic condition to the credit quality of a loan portfolio.  The credit cycle can be thought of as the historical pattern of credit rating shared by all borrowers in a sector or economy.Read More »