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

Showing results for

- JMP User Community
- :
- Discussions
- :
- lack-of-fit-test is missing

- 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

May 20, 2016 2:17 AM
(475 views)

Hello.

I have created a full factorial design with two X variables and one response value (Health as a function of your drinking and smoking habits, see enclosed files).

When I generate the report, the lack-of-fit test is greyed out. But why? The fitting-linear-models-pdf from the jmp-help says:

In the following situations, the Lack of Fit report does not appear because the test statistic

cannot be computed:

• There are no replicated points with respect to the X variables, so it is impossible to

calculate a pure error sum of squares.

• The model is saturated, meaning that there are as many estimated parameters as there are

observations. Such a model fits perfectly, so it is impossible to assess lack of fit.

I have 3 replicated points for every X variable and 27 observations which is a greater number than the estimated parameters. So why can't I compute the LoF-test?

1 REPLY

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

May 20, 2016 6:14 AM
(360 views)