turn on suggestions

Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.

Showing results for

- JMP User Community
- :
- Discussions
- :
- JMP13 fitting Defective Subpopulation Weibull; wou...

Topic Options

- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Get Direct Link
- Email to a Friend
- Report Inappropriate Content

Feb 21, 2017 11:43 AM
(481 views)

JMP13 fitting defective subpopulation weibull; would like to constrain exponent parameter < 1

I see that under Parametric Estimate - DS Weibull red triangle menu there is a Fix Parameter, but (a) it offers location and scale, not the Weibull exponent and (b) it seems not to allow for applying an inequality constraint to specify a maximum value for a parameter (DS exponent might ideally be sub-unity for example).

1 REPLY

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Get Direct Link
- Email to a Friend
- Report Inappropriate Content

Feb 21, 2017 11:56 AM
(478 views)

That is correct, JMP provides the Weibull model in both versions, the location and scale version and the shape and scale version. Fits fits the location and scale version, so that is the way that you fix one of the parameters to a given value.The transformation between versions is straight-forward, so if you have the shape or scale, you can transform it to the location or scale.

The parameter constraint is not over an interval but to a single point, like setting an intercept equal to zero.

Learn it once, use it forever!