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help > RE: Design matrix and contrast for 2 way ANOVA, and f-value
Jan 21, 2020 11:01 AM | Andrew Zalesky
RE: Design matrix and contrast for 2 way ANOVA, and f-value
Hi David,
0 -1 0 0 means that group drug > group placebo ?
YES
0 0 -1 0 means that cond B > cond A ?
YES
0 0 0 -1 what would be here the meaning? How can I define this interaction?
The meaning of the interaction is no different to any other interaction term in a general linear model. The easiest way to understand the interaction is to visualize it.
Once again, I emphasize that the interaction term for the NBS is no different from any other interaction in a general linear model.
Andrew
Originally posted by davideit7:
as you suggested I've used a t-test and separately used a contrast of 1 and -1, however I'm not sure about the meaning of the different contrasts:0 -1 0 0 means that group drug > group placebo ?
0 0 -1 0 means that cond B > cond A ?
0 0 0 -1 what would be here the meaning? How can I define this interaction?
Sincerly,
Davide
0 -1 0 0 means that group drug > group placebo ?
YES
0 0 -1 0 means that cond B > cond A ?
YES
0 0 0 -1 what would be here the meaning? How can I define this interaction?
The meaning of the interaction is no different to any other interaction term in a general linear model. The easiest way to understand the interaction is to visualize it.
Once again, I emphasize that the interaction term for the NBS is no different from any other interaction in a general linear model.
Andrew
Originally posted by davideit7:
Hi Dr. Zalesky,
eventually I've decided to use the design matrix below (2nd column treatment, 3rd condition, 4th interaction)
eventually I've decided to use the design matrix below (2nd column treatment, 3rd condition, 4th interaction)
1-P_A 1 1 1 1
1-P_B 1 1 -1 -1
2-P_A 1 1 1 1
2-P_B 1 1 -1 -1
3-D_A 1 -1 1 -1
3-D_B 1 -1 -1 1
4-D_A 1 -1 1 -1
4-D_B 1 -1 -1 1
as you suggested I've used a t-test and separately used a contrast of 1 and -1, however I'm not sure about the meaning of the different contrasts:0 -1 0 0 means that group drug > group placebo ?
0 0 -1 0 means that cond B > cond A ?
0 0 0 -1 what would be here the meaning? How can I define this interaction?
Sincerly,
Davide
Threaded View
| Title | Author | Date |
|---|---|---|
| Woomi Ban | May 30, 2019 | |
| davideit7 | Dec 5, 2019 | |
| Andrew Zalesky | Dec 6, 2019 | |
| davideit7 | Dec 6, 2019 | |
| Andrew Zalesky | Dec 7, 2019 | |
| davideit7 | Jan 20, 2020 | |
| Andrew Zalesky | Jan 21, 2020 | |
| davideit7 | Jan 22, 2020 | |
| Andrew Zalesky | Jan 23, 2020 | |
| Woomi Ban | Jun 10, 2019 | |
| Andrew Zalesky | Jun 10, 2019 | |
| Andrew Zalesky | Jun 1, 2019 | |