st: weird ROC curve

[Arnold Kester <Arnold.Kester@stat.unimaas.nl>]

I just produced the weirdest ROC curve I've ever seen, and I suspect
there's a bug in roctab. The curve jumps up and down which is by
definition not possible. For your amusement and curiosity I append the
data. I am aware that as a diagnostic, x is worthless to predict y.

what I did was

insheet using roc_data.out
roctab y x, graph

Thanks,
Arnold Kester

Attachment: roc_data.out
Description: application/unknown-content-type-out_auto_file