Figure 1: Estimated probability of Success7Sem with relation to GPA and test result. Both predictors were dichotomised at the median (GPA (=Abi) good: <1.6 and test good: >median). The quality of a predictor can be read from the difference between study success probability of good and bad manifestations. For instance, the study success probability of participants with a good GPA is significantly higher for good than for bad HAM-Nat participants. For the NatDenk this difference is considerably smaller.