| Deletions are marked like this. | Additions are marked like this. |
| Line 1: | Line 1: |
| Two Groups (One Factor/Two Levels), One Covariates | = Two Groups (One Factor/Two Levels), One Covariates = |
| Line 7: | Line 7: |
| FSGD File: example3.fsgd | === FSGD File === |
| Line 18: | Line 18: |
|
Nclasses = 2<<BR>> Nvariables = 1<<BR>> |
Nclasses = 2 <<BR>> Nvariables = 1 <<BR>> |
| Line 21: | Line 21: |
|
-------------------------------------------------------------------------------------- DODS Regressors: <<BR>> |
=== Regressors === |
| Line 30: | Line 29: |
| Contrasts: | === Contrasts === |
| Line 32: | Line 31: |
| Contrast1: ------------ | ===== Contrast1 ===== |
| Line 44: | Line 43: |
| Contrast2: <<br>> | ===== Contrast2: ===== |
| Line 59: | Line 58: |
| Contrast3: ------------ | ===== Contrast3: ===== |
| Line 63: | Line 62: |
| --------------- cut here -------------- | {{{ |
| Line 66: | Line 65: |
| --------------- cut here -------------- | }}} |
| Line 69: | Line 68: |
| Contrast4: ------------ | ===== Contrast4 ===== |
| Line 73: | Line 72: |
| --------------- cut here -------------- | {{{ |
| Line 75: | Line 74: |
| --------------- cut here -------------- | }}} |
| Line 77: | Line 76: |
| Contrast5: ------------ | ===== Contrast5 ===== |
| Line 81: | Line 80: |
| --------------- cut here -------------- | {{{ |
| Line 83: | Line 82: |
| --------------- cut here -------------- | }}} |
Two Groups (One Factor/Two Levels), One Covariates
This models the input as two lines. If DODS, then each line has its own intercept and slope. If DOSS, then each line has its own intercept but they share a slope.
FSGD File
GroupDescriptorFile 1 Title OSGM Class Group1 Class Group2 Variable Age Input subject1 Group1 30 Input subject2 Group2 40
Nclasses = 2
Nvariables = 1
Regressors
Nregressors = Nclasses*(Nvariables+1) = 2*(1+1) = 4
Regressor1: ones for subjects in Group 1, 0 otherwise. Codes intercept/mean for Group 1
Regressor2: ones for subjects in Group 2, 0 otherwise. Codes intercept/mean for Group 2
Regressor3: age for subjects in Group 1, 0 otherwise. Codes age slope for Group 1
Regressor4: age for subjects in Group 2, 0 otherwise. Codes age slope for Group 2
Contrasts
Contrast1
Null Hypothesis: is there a difference between the group intercepts?
Contrast File: g1-g2.intercept.mtx
1 -1 0 0
Since this is a t-test, the output will be signed, with Group1>Group2 being positive (red/yellow). Reversing the sign will only change the sign of the output, not its magnitude.
Contrast2:
Null Hypothesis: is there a difference between the group slopes? Note: this is an interaction between group and age. Note: not possible to test with DOSS
Contrast File: g1-g2.slope.mtx
0 0 1 -1
Since this is a t-test, the output will be signed, with Group1>Group2 being positive (red/yellow). Reversing the sign will only change the sign of the output, not its magnitude.
===== Contrast3: ===== Null Hypothesis: does Group1 differ from Group2 in intercept or slope?
Contrast File: g1-vs-g2.mtx
1 -1 0 0 0 0 1 -1
Note: this is an F-test (and hence unsigned).
Contrast4
Null Hypothesis: does mean of group intercepts differ from 0?
Contrast File: g1g2.intercept.mtx
0.5 0.5 0 0
Contrast5
Null Hypothesis: does mean of group slopes differ from 0?
Contrast File: g1g2.intercept.mtx
0 0 0.5 0.5