I am assigned to develop a credit score model to predict the default rate of applicants in the future.
I have some data such as credit card information, loan information, application inquiry information and other personal information like income, job status,job history,employer,education,and endowment/medical insurance. But not every applicant has all above information. For example, some people don't have credit card and loan information, some people just have credit card information.
I plan to build three scorecards for creditcard&inquiry information, loan&inquiry information and inquiry&personal information, respectively.
How do I generate a unique final score through the three socorecards,
using information value to determine the weight of each scorecard or other methods?
Does anyone know how FICO does?
Any information is apprecitated!