[evanb]

I meant more along the lines of a user-entered histogram. But that's roughly the same as what you're talking about. It does seem that such a thing must roughly correspond to some internal portion of Guesstimate, anyway. So for an advanced user to punch a distribution in would be handy. May be out-of-scope for this project? I guess really I'm looking for a way to error propagate my home-grown datasets :)