Flawed Models or Misused Models. The Role of Modeling in the Mortgage Meltdown. Basic Modeling Tenets. Use it Appropriately Validate It Properly Stress It Understand it and Explain it Simplify It. Structure of Practical Mortgage Modeling.
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The Role of Modeling in the Mortgage Meltdown
State Space A: Three States, Two terminating
State Space B: Form Loan Performance Technical Paper: 9 states, 2 terminating
Combinations of Environmental variables (interest rates, HPI) and borrower variables (FICO, LTV, etc.)
Refinancing Activity = burnout * seasoningi * seasonalityt*refin,t* Media Effect
Ratio of C/R
Where C mortgage rate
R is market rate.