Hi @alj I reproducibly get the following, using your code:
SamplingError: Initial evaluation of model at starting point failed!
Starting values:
{'cut_ordered__': array([-2.9111608 , 0.40300104, 0.31628445, -0.30367939, 0.51787646,
0.2265195 ]), 'β0': array(-0.42200085)}
Logp initial evaluation results:
{'cut': 0.85, 'β0': -1.01, 'y': -inf}