tally {Correlplot}

Create a tally on a biplot vector

Description

Function tally marks of a set of dots on a biplot vector. It is thought for biplot vectors representing correlations, such that their correlation scale becomes visible, without doing a full calibration with tick marks and tick mark labels.

Usage

tally(G, adj = 0, values = seq(-1, 1, by = 0.2), pch = 19, dotcolor = "black", cex = 0.5,
      color.negative = "red", color.positive = "blue")

Arguments

G

Matrix with biplot coordinates of the variables

adj

A scalar adjustment for the correlations

values

The values of the correlations to be marked off by dots

pch

The character code used for marking off correlations

dotcolor

The colour of the dots that are marked off

cex

The character expansion factor for a dot.

color.negative

The colour of the segments of the negative part of the correlation scale

color.positive

The colour of the segments of the positive part of the correlation scale

Value

NULL

Author(s)

Jan Graffelman ([e-mail])

References

Graffelman, J. and De Leeuw, J. (2023) Improved approximation and visualization of the correlation matrix. The American Statistician pp. 1–20. doi:10.1080/00031305.2023.2186952

See Also

bplot, calibrate

Examples

data(goblets)
R <- cor(goblets)
results <- eigen(R)
V  <- results$vectors
Dl <- diag(results$values)
#
# Calculate correlation biplot coordinates
#
G  <- crossprod(t(V[,1:2]),sqrt(Dl[1:2,1:2]))
#
# Make the biplot
#
bplot(G,G,rowch=NA,colch=NA,collab=colnames(R),
      xl=c(-1.1,1.1),yl=c(-1.1,1.1))
#
# Create a correlation tally stick for variable X1
#
tally(G[1,])