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

- JMP User Community
- :
- Discussions
- :
- Means displayed in a Nested analysis do not match Fit Y by X calculated means......

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

Highlighted

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

Created:
Oct 6, 2016 8:24 AM
| Last Modified: Oct 18, 2016 9:16 PM
(7258 views)

I am running a Fit Model where the effects are nested. The Means displayed in the Least Squares Means Table for the higher level effect (TT in my data), do not even come close to what a simple calculation of the means using Fit Y by X show.

The description of the Least Squares Means Table indicates that the Mean displayed is the "sample mean for the given level".

I would appreciate if someone more versed in Nested ANOVAs than I am can provide me with an explanation.

I have attached the data table with an embedded script.

Jim

1 ACCEPTED SOLUTION

Accepted Solutions

Highlighted

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

Jim,

Apparently it is the *No Intercept* option that you selected caused the problem. In other words, if you include the intercept, they match. I agree with you that means should match, but I don't know why this happens. Please contact support@jmp.com, and I am sure they will give you an answer :-)

3 REPLIES 3

Highlighted
##

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

Re: Means displayed in a Nested analysis do not match Fit Y by X calculated means....why?

Created:
Oct 7, 2016 6:47 AM
| Last Modified: Oct 18, 2016 9:17 PM
(7102 views)
| Posted in reply to message from txnelson 10-06-2016

I am believe you are doing two different analyses here, the fit Y by X only looks at once X at a time, where the Fit Model is using TT and TN at the same time. I ran the fit model using only TT and came up with the same means as the fit Y by X.

Highlighted
##

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

Re: Means displayed in a Nested analysis do not match Fit Y by X calculated means....why?

Isaac,

I understand that I am doing 2 different analyses, however, the documentation seems to indicate that what the Mean value should be is the Sample Mean, and that the Least Sq Mean will be different, not the Sample Mean.

Jim

Highlighted

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

Jim,

Apparently it is the *No Intercept* option that you selected caused the problem. In other words, if you include the intercept, they match. I agree with you that means should match, but I don't know why this happens. Please contact support@jmp.com, and I am sure they will give you an answer :-)

Article Labels

There are no labels assigned to this post.