simple_effects.RdThis is a convenience function to re-estimates a GAMLj model adding simple effect analysis. If no option is passed, extracts the simple effects tables already in the model results (if any). If new tests are defined, the simple effects tests tables are returned.
simple_effects(object, ...)
# S3 method for class 'gamlj'
simple_effects(object, formula = NULL, ...)a gamlj results object of the class `gamlj`
all options accepted by a gamlj model function. Relevant for new tests are
`simple_x` (the simple effect variable), `simple_mods`, the moderator(s). Both are overriden by the formula option.
a right hand side formula specifying the variables to test, of the form `~x:z`, `~x:z:w` or `~x*z`. The formula is not expanded, so the first variable is the simple effect variable, the second is the moderator, the third an optional additional moderator, an so on. It has prevalence on other options defining a simple effects test via character options.
a list of tables of class `ResultsElement`
data(wicksell)
wicksell$time<-factor(wicksell$time)
wicksell$group<-factor(wicksell$group)
wicksell$subj<-factor(wicksell$subj)
gmod<-GAMLj3::gamlj_mixed(
formula = dv ~ 1 +group+ time:group+ time+( 1 | subj ),
data = wicksell)
simple_effects(gmod,formula =~time:group)
#>
#> SIMPLE EFFECTS
#>
#> ANOVA for Simple Effects of time
#> ───────────────────────────────────────────────────────────
#> group F Num df Den df p
#> ───────────────────────────────────────────────────────────
#> 1 18.86500 3.000000 66.00000 < .0000001
#> 2 35.28400 3.000000 66.00000 < .0000001
#> ───────────────────────────────────────────────────────────
#>
#>
#> Parameter Estimates for simple effects of time
#> ─────────────────────────────────────────────────────────────────────────────────────────────────────────────────
#> group Effect Estimate SE Lower Upper df t p
#> ─────────────────────────────────────────────────────────────────────────────────────────────────────────────────
#> 1 1 - 0 -47.66667 21.45003 -90.49303 -4.840307 66.00000 -2.222219 0.0297010
#> 3 - 0 -88.58333 21.45003 -131.40969 -45.756973 66.00000 -4.129754 0.0001043
#> 6 - 0 -155.50000 21.45003 -198.32636 -112.673640 66.00000 -7.249408 < .0000001
#> 2 1 - 0 -185.91667 21.45003 -228.74303 -143.090307 66.00000 -8.667433 < .0000001
#> 3 - 0 -180.08333 21.45003 -222.90969 -137.256973 66.00000 -8.395483 < .0000001
#> 6 - 0 -173.75000 21.45003 -216.57636 -130.923640 66.00000 -8.100223 < .0000001
#> ─────────────────────────────────────────────────────────────────────────────────────────────────────────────────
#>