turn on suggestions

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

Showing results for

Find a Community

- Home
- /
- Analytics
- /
- Stat Procs
- /
- Linear constrasts

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
- Permalink
- Email to a Friend
- Report Inappropriate Content

04-01-2011 09:31 AM

Hello friends,

I am trying to set up few contrasts statements for a design with three different treatments (T, P, and K). T has three levels and P and K has four levels each. I do know that interaction T x K is significant. Now I want to test if response of K is linear for dependent variable Y. Then the next question is if this linear response holds true for each level of T.

Can somebody check if the following contrasts are right to answer second question?

Contrast "K linear in T1" T*K -3 -1 1 3;

Contrast "K linear in T2" T*K 0 0 0 0 -3 -1 1 3;

Contrast "K linear in T3" T*K 0 0 0 0 0 0 0 0 -3 -1 1 3;

I don’t know what should be the contrast for answering first question. While righting contrasts does it matter if out levels are equally spaced or not.

The variable T is categorical while P and K are unequally spaced quantitative variables.

Thanks

Bhupinder

I am trying to set up few contrasts statements for a design with three different treatments (T, P, and K). T has three levels and P and K has four levels each. I do know that interaction T x K is significant. Now I want to test if response of K is linear for dependent variable Y. Then the next question is if this linear response holds true for each level of T.

Can somebody check if the following contrasts are right to answer second question?

Contrast "K linear in T1" T*K -3 -1 1 3;

Contrast "K linear in T2" T*K 0 0 0 0 -3 -1 1 3;

Contrast "K linear in T3" T*K 0 0 0 0 0 0 0 0 -3 -1 1 3;

I don’t know what should be the contrast for answering first question. While righting contrasts does it matter if out levels are equally spaced or not.

The variable T is categorical while P and K are unequally spaced quantitative variables.

Thanks

Bhupinder