lava (version 1.4.7)

path: Extract pathways in model graph

Description

Extract all possible paths from one variable to another connected component in a latent variable model. In an estimated model the effect size is decomposed into direct, indirect and total effects including approximate standard errors.

Usage

"path" (object, to = NULL, from, all=FALSE, ...)
"effects" (object, to, from, silent=FALSE, ...)

Arguments

object

Model object (lvm)

to

Outcome variable (string). Alternatively a formula specifying response and predictor in which case the argument from is ignored.

from

Response variable (string), not necessarily directly affected by to.

all

If TRUE all simple paths (in undirected graph) is returned

silent

Logical variable which indicates whether messages are turned on/off.

...

Additional arguments to be passed to the low level functions

Value

If object is of class lvmfit a list with the following elements is returned elements is returnedIf object is of class lvm only the path element will be returned.The effects method returns an object of class effects.

See Also

children, parents

Examples

m <- lvm(c(y1,y2,y3)~eta)
regression(m) <- y2~x1
latent(m) <- ~eta
regression(m) <- eta~x1+x2
d <- sim(m,500)
e <- estimate(m,d)

path(Model(e),y2~x1)
parents(Model(e), ~y2)
children(Model(e), ~x2)
children(Model(e), ~x2+eta)
effects(e,y2~x1)
## All simple paths (undirected)
path(m,y1~x1,all=TRUE)