ggtally: Create a correlation tally stick on a biplot vector

In Correlplot: A Collection of Functions for Graphing Correlation Matrices

Create a correlation tally stick on a biplot vector

Description

Function ggtally puts a series of dots along a biplot vector of a correlation matrix, so marking the change in correlation along the vector with specified values.

Usage

ggtally(G, p1, adj = 0, values = seq(-1, 1, by = 0.2), dotsize = 0.1, dotcolour = "black")

Arguments

G	A matrix (or vector) of biplot markers
p1	A ggplot2 object with a biplot
adj	A scalar adjustment for the correlations
values	Values of the correlations to be marked off by dots
dotsize	Size of the dot
dotcolour	Colour of the dot

Details

Any set of values for the correlation to be marked off can be used, though a standard scale with 0.2 increments is recommmended.

Value

A ggplot2 object with the updated biplot

Author(s)

Jan Graffelman ([e-mail])

References

Graffelman, J. and De Leeuw, J. (2023) On the visualisation of the correlation matrix. Available online. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.48550/arXiv.2211.13150")}

See Also

ggbplot

Examples

library(calibrate)
data(goblets)
R <- cor(goblets)
out.sd <- eigen(R)
V  <- out.sd$vectors[,1:2]
Dl <- diag(out.sd$values[1:2])
Gp <- crossprod(t(V),sqrt(Dl))
pca.df <- data.frame(Gp)
pca.df$strings <- colnames(R)
colnames(pca.df) <- c("PA1","PA2","strings")
p1 <- ggbplot(pca.df,pca.df,main="PCA correlation biplot",xlab="",ylab="",rowarrow=TRUE,
              rowcolor="blue",rowch="",colch="")
p1 <- ggtally(Gp,p1,values=seq(-0.2,0.6,by=0.2),dotsize=0.1)

Correlplot documentation built on June 22, 2024, 11:34 a.m.