Handling Missing Business Cycle Phases in Credit Default Models
Summary
The discussion considers how to build probability of default models when the available observations do not span a full economic cycle. It suggests separating the cycle into recovery, expansion, slowdown, and recession phases, then identifying which phases are absent. When recession observations are missing, comparable industry or sector data and evidence from past downturns may help inform estimates; the analyst must judge how much adjustment is appropriate. If favorable periods are missing, the response suggests a conservative treatment that retains upside in default assumptions.
A second answer points to recession indicators and notes that current conditions can be estimated by extending the latest observed state or by using a transition probability matrix. The exchange does not give a formal test for deciding whether a sample covers a complete cycle, nor does it provide a validated imputation procedure or empirical results. Its recommendations are broad and depend on the issuer, sector, data, and modeling purpose.
Key ideas
- Assess which business cycle phases are represented before fitting a credit default model.
- Comparable sector data and past downturns may help inform missing recession observations.
- Decisions about adjusting proxy data require judgment and depend on the case.
- A transition probability matrix can be used to estimate movement between cycle states.
- The discussion does not specify a definitive test for complete cycle coverage.
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Full text
# Business cycles and missing data # Business cycles and missing data For many probability of defaults models in credit risk it is needed to use data observed from a "full" business cycles. Usually a business cycle is defined as a recurring (not necessarily periodic) economic cycle of recession and expansion. My question now is pretty general but maybe there is some knowledge of it. Are there any available methods to compensate if not a full business cycle is observed? And how can one tell if a full business cycle is observed? Thanks for any help! ## Answer by Larasing (score 1, accepted) https://quant.stackexchange.com/a/24650 General questions beget general answers but hopefully mine offers some additional insight. If you do not have full business cycles, how about different phases in the business cycle (generally one could say there are 4)? Recovery, Expansion, Slowdown, Recession. If you are missing recession data you can generally fill those in using comparable industry/sector data. There has to be SOMETHING that exists in SOME shape or form for the Great Recession of 08, Dot Com bubble of 01-02... and you can always look at smaller downturns that affect sector specific spreads. The judgement call here would be how much do you tweak that. If you are missing "the good times" that is not so important. One could always be conservative and retain upside (especially in the case of default assumption). Again, really not sure what you are looking at, so specific cases might require specific techniques. ## Answer by phdstudent (score 0) https://quant.stackexchange.com/a/22060 I am not clear with what you mean. You usually have data on business cycle up until two quarters before the actual date. Check the NBER: https://research.stlouisfed.org/fred2/series/USRECM If you want to know the current business cycle you can just extrapolate it from the last data point, or you can compute a probability transition matrix.
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