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Source: Danmarks Nationalbank

It is typically assumed within corporate default modeling that the covariates have a linear effect on the log-hazard scale, no interactions, and that there is only a single additive latent factor on the log-hazard scale. Using a sample of US corporate firms, we show in this paper that these standard assumptions are too strict and that they matter in practice. We propose instead a frailty-model that relaxes these assumptions and takes into account time-varying covariates, while being able to provide forecasts for arbitrary portfolios.

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