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| = 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 <<BR>> Nvariables = 1 <<BR>> === Regressors === Nregressors = Nclasses*(Nvariables+1) = 2*(1+1) = 4 <<BR>> Regressor1: ones for subjects in Group 1, 0 otherwise. Codes intercept/mean for Group 1 <<BR>> Regressor2: ones for subjects in Group 2, 0 otherwise. Codes intercept/mean for Group 2 <<BR>> Regressor3: age for subjects in Group 1, 0 otherwise. Codes age slope for Group 1 <<BR>> Regressor4: age for subjects in Group 2, 0 otherwise. Codes age slope for Group 2 <<BR>> === 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 }}} |
~+'''One Group, One Covariate'''+~ |
One Group, One Covariate