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Total Indirect Effect Between Two Variables

Source: R/total_indirect_effect_list.R
total_indirect_effect.Rd

Compute the total indirect effect between two variables in the paths estimated by many_indirect_effects().

Usage

total_indirect_effect(object, x, y)

Arguments

object

The output of many_indirect_effects(), or a list of indirect-class objects.

x

Character. The name of the x variable. All paths start from x will be included.

y

Character. The name of the y variable. All paths end at y will be included.

Value

An indirect-class object.

Details

It extracts the indirect-class objects of relevant paths and then add the indirect effects together using the + operator.

See also

many_indirect_effects()

Examples


library(lavaan)
data(data_serial_parallel)
mod <-
"
m11 ~ x + c1 + c2
m12 ~ m11 + x + c1 + c2
m2 ~ x + c1 + c2
y ~ m12 + m2 + m11 + x + c1 + c2
"
fit <- sem(mod, data_serial_parallel,
           fixed.x = FALSE)

# All indirect paths, control variables excluded
paths <- all_indirect_paths(fit,
                            exclude = c("c1", "c2"))
paths
#> Call: 
#> all_indirect_paths(fit = fit, exclude = c("c1", "c2"))
#> Path(s): 
#>   path                
#> 1 m11 -> m12 -> y     
#> 2 x -> m11 -> m12     
#> 3 x -> m11 -> m12 -> y
#> 4 x -> m11 -> y       
#> 5 x -> m12 -> y       
#> 6 x -> m2 -> y        

# Indirect effect estimates
out <- many_indirect_effects(paths,
                             fit = fit)
out
#> 
#> ==  Indirect Effect(s)   ==
#>                        ind
#> m11 -> m12 -> y      0.241
#> x -> m11 -> m12      0.372
#> x -> m11 -> m12 -> y 0.193
#> x -> m11 -> y        0.163
#> x -> m12 -> y        0.059
#> x -> m2 -> y         0.364
#> 
#>  - The 'ind' column shows the indirect effects.
#>  

# Total indirect effect from x to y
total_indirect_effect(out,
                      x = "x",
                      y = "y")
#> 
#> == Indirect Effect  ==
#>                                           
#>  Path:                x -> m11 -> m12 -> y
#>  Path:                x -> m11 -> y       
#>  Path:                x -> m12 -> y       
#>  Path:                x -> m2 -> y        
#>  Function of Effects: 0.780               
#> 
#> Computation of the Function of Effects:
#>  (((x->m11->m12->y)
#> +(x->m11->y))
#> +(x->m12->y))
#> +(x->m2->y) 
#>