STK_EXAMPLE_DOE04  Probability of misclassification

 The upper panel shows posterior means and variances as usual, and the
 threshold of interest, which is at T = 0.85 (dashed line).

 The lower panel shows the probability of misclassification as a function of x
 (blue curve), i.e., the probability that the actual value of the function is
 not on the same side of the threshold as the prediction (posterior mean).

 We also plot the expected future probability of misclassification (magenta
 curve), should a new evaluation be made at x = 3.

 Note that both probabilities are obtained using stk_pmisclass.