Scree test

scree_plot generates a scree plot with superimpose parallel analysis

scree_plot(data, n.iter = 50, method = c("pc", "pa", "ml"), ...)

Arguments

data	a data frame or correlation matrix.
n.iter	number of iterations for parallel analysis.
method	factoring method (pc, pa, or ml).
...	parameters passed to psych::fa.parallel.

Value

a ggplot2 graph

Details

The scree_plot function is a wrapper for the psych::parallel function. A ggplot2 graph is produced with the scree plot and parallel analysis (scree plot for simulated data) based on the method chosen. The methods are principal components ("pc"), principal axis ("pa"), and maximum likelihood ("ml") factoring.

Examples

scree_plot(Harman74.cor$cov, method="pc", n.obs=145)
#> 
#> Note: parallel analysis suggests 3 components.