by Koedijk, C.G., Mahieu, R.J., Moerman, G.A.
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Suggested foundations for financial time series and credit and counterparty risk. Specialist prerequisites vary by paper.
Check whether a relationship can be estimated consistently over time.
Read the fitted relationship and its residuals.
Separate default probability, loss severity and exposure.
Read conditional default and exposure quantities.
Study long-run relationships without confusing them with correlation.
Check the assumptions behind reported estimates.
Study dependence between defaults.
Choose a reproducible strategy, specify the trading rule, and test what remains after costs and estimation uncertainty.