normal.test performs multi-period testing of PD model predictive power. This procedure can be applied
on the level of the rating grade as well on the portfolio level.
Usage
normal.test(pdc, odr, alpha = 0.05)
Value
The command normal.test returns a data frame with estimated difference between odr and
pdc, test statistics, standard error of the test statistics, selected significance level,
p-value of test statistics and finally the test results.
Arguments
pdc
Numeric vector of calibrated probabilities of default (PD).
odr
Numeric vector of observed default rates.
alpha
Significance level of p-value for implemented tests. Default is 0.05.
References
Basel Committee on Banking Supervision (2005). Studies on the Validation of Internal
Rating Systems, working paper no. 14.