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Last data update: 2014.03.03

R: Case influence on model fit.

fitinfluence

R Documentation

Case influence on model fit.

Description

This function evaluate the case's effect on a user-defined fit index.

Usage

fitinfluence(index, model, data, ...)

Arguments

`index`	A model fit index.
`model`	A description of the user-specified model using the lavaan model syntax. See `lavaan` for more information.
`data`	A data frame containing the observed variables used in the model. If any variables are declared as ordered factors, this function will treat them as ordinal variables.
`...`	Additional parameters for `sem` function.

Value

Returns a data.frame of case influence.

Note

If for observation i model does not converge or yelds a solution with negative estimated variances, the associated value of influence is set to NA.

Author(s)

Massimiliano Pastore

References

Pek, J., MacCallum, R.C. (2011). Sensitivity Analysis in Structural Equation Models: Cases and Their Influence. Multivariate Behavioral Research, 46, 202-228.

Examples

## not run: this example take several minutes
data("PDII")
model <- "
  F1 =~ y1+y2+y3+y4
"

# fit0 <- sem(model, data=PDII)
# FI <- fitinfluence("cfi",model,data=PDII)
# plot(FI,pch=19)

## not run: this example take several minutes
## an example in which the deletion of a case yelds a solution 
## with negative estimated variances
model <- "
  F1 =~ x1+x2+x3
  F2 =~ y1+y2+y3+y4
  F3 =~ y5+y6+y7+y8
"

# fit0 <- sem(model, data=PDII)
# FI <- fitinfluence("rmsea",model,PDII)
# explore.influence(FI)