Francis Gichere’s Post

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Data Scientist @ BURN | Msc Data Science | Decision Modelling | Applied ML | Applied AI | 5+ Yrs. Experience in Data | DS Researcher

Credit modelling has always been a fascinating field for me. Historically, credit risk modeling is based on a mix of rules (“manual feature engineering” in modern ML jargon) and logistic regression. Expert knowledge is vital to creating a good model. Building adapted customer segmentation as well as studying the influence of each variable and the interactions between variables requires enormous time and effort. Combined with advanced techniques like two-stage models with offset, advanced general linear models based on Tweedie distribution, or monotonicity constraints on one side and financial risk management techniques on the other side, this makes the field a playground for actuaries. Gradient boosting algorithms like XGBoost have reduced the cost to build good models. However, their validation is made more complex by the black box effect: it’s hard to get the feeling that such models give sensible results whatever the inputs. Nevertheless, credit risk modelers have learned to use and validate these new types of models. They have developed new validation methodologies based, for example, on individual explanations (like the Shapley values) to build trust into their models, which is a critical component of MLOps. #creditrisk #mlops #banking #datascience #creditriskmodelling #analyticsengineering

Tony Gitonga

Data Scientist | Business Analyst Expert | Digital Banking | Strategy | Actuarial Scientist | Bookmaker | Data Analyst

11mo

In the realm of credit risk modeling, where complexity and precision intertwine, advanced techniques unfurl like a tapestry of artistry. Two-stage models, adorned with their elusive offsets, take center stage, orchestrating a harmonious blend of insight. Meanwhile, the stage is graced by the presence of sophisticated general linear models, their foundations anchored in the enigmatic Tweedie distribution. Here, the very essence of monotonicity is not just a suggestion but an unwavering decree, as constraints enforce a dance of unbroken ascendancy. It is a symphony where the actuary's hand, skilled and knowing, finds its playground, shaping the boundaries of risk and reward with meticulous expertise. Francis Gichere

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