For that you’d compute the wackiness of a person’s current revealed utility function with respect to the one they had five minutes ago over the last four days and add all the wackinesses together. If this result is more than four standard deviations above the average they can be considered insane.
I’m not sure that really captures most of what passes for ‘insane’.
I’m not sure that really captures most of what passes for ‘insane’.