https://github.com/cran/nFactors
Tip revision: 592b098fc786911733da1c1953e58c9d1c2e9517 authored by Gilles Raiche on 10 April 2010, 00:00:00 UTC
version 2.3.3
version 2.3.3
Tip revision: 592b098
plotnScree.R
"plotnScree" <-
function (nScree,
legend = TRUE,
ylab = "Eigenvalues",
xlab = "Components",
main = "Non Graphical Solutions to Scree Test")
{
if (!inherits(nScree, "nScree")) stop("Method is only for nScree objects")
#if (!exists("legend", mode="logical") ) legend <- TRUE # To develop
#if (!exists("ylab")) ylab <- "Eigenvalues" # To develop
#if (!exists("xlab")) xlab <- "Components" # To develop
#if (!exists("main")) main <- "Non Graphical Solutions to Scree Test" # To develop
if (nScree$Model == "components") nkaiser = "Eigenvalues (>mean = " else nkaiser = "Eigenvalues (>0 = "
if (nScree$Model == "factors") xlab = "Factors"
par(col = 1, pch = 1) # Color and symbol for usual scree
par(mfrow = c(1,1))
eig <- nScree$Analysis$Eigenvalues
k <- 1:length(eig)
#plotuScree(x=eig, ...) # To develop
plotuScree(x=eig, main=main, xlab=xlab, ylab=ylab)
nk <- length(eig)
noc <- nScree$Components$noc
vp.p <- lm(eig[c(noc+1,nk)] ~ k[c(noc+1,nk)])
x <- sum(c(1,1) * coef(vp.p))
y <- sum(c(1,nk)* coef(vp.p))
par(col = 10) # Color for optimal coordinates
lines(k[c(1,nk)],c(x,y))
par(col = 11,pch=2) # Color and symbol for parallel analysis
lines(1:nk, nScree$Analysis$Par.Analysis, type = "b")
if (legend == TRUE) {
leg.txt <- c(paste(nkaiser,nScree$Components$nkaiser,")"),
c(paste("Parallel Analysis (n = ",nScree$Components$nparallel,")")),
c(paste("Optimal Coordinates (n = ",nScree$Components$noc,")")),
c(paste("Acceleration Factor (n = ",nScree$Components$naf,")")) )
legend("topright",
legend = leg.txt,
pch = c(1,2,NA,NA),
text.col = c(1,3,2,4), col = c(1,3,2,4)
)
}
naf <- nScree$Components$naf
text(x = noc , y = eig[noc], label = " (OC)", cex = .70, adj = c(0,0), col = 2)
text(x = naf + 1, y = eig[naf + 1], label = " (AF)", cex = .70, adj = c(0,0), col = 4)
}