ICLUST.rgraph {psych}R Documentation

Draw an ICLUST graph using the Rgraphviz package

Description

Given a cluster structure determined by ICLUST, create a rgraphic directly using Rgraphviz. To create dot code to describe the ICLUST output with more precision, use ICLUST.graph. As an option, dot code is also generated and saved in a file. To use the dot code, use either http://www.graphviz.org/ Graphviz or a commercial viewer (e.g., OmniGraffle).

Usage

ICLUST.rgraph(ic.results, out.file = NULL, min.size = 1, short = FALSE, 
    labels = NULL, size = c(8, 6), node.font = c("Helvetica", 14), 
   edge.font = c("Helvetica", 10), rank.direction=c("RL","TB","LR","BT"),
    digits = 2, title = "ICLUST",label.font=2, ...)

Arguments

ic.results

output list from ICLUST

out.file

File name to save optional dot code.

min.size

draw a smaller node (without all the information) for clusters < min.size – useful for large problems

short

if short==TRUE, don't use variable names

labels

vector of text labels (contents) for the variables

size

size of output

node.font

Font to use for nodes in the graph

edge.font

Font to use for the labels of the arrows (edges)

rank.direction

LR or TB or RL

digits

number of digits to show

title

any title

label.font

The variable labels can be a different size than the other nodes. This is particularly helpful if the number of variables is large or the labels are long.

...

other options to pass

Details

Will create (or overwrite) an output file and print out the dot code to show a cluster structure. This dot file may be imported directly into a dot viewer (e.g., http://www.graphviz.org/). The "dot" language is a powerful graphic description language that is particulary appropriate for viewing cluster output. Commercial graphics programs (e.g., OmniGraffle) can also read (and clean up) dot files.

ICLUST.rgraph takes the output from ICLUST results and processes it to provide a pretty picture of the results. Original variables shown as rectangles and ordered on the left hand side (if rank direction is RL) of the graph. Clusters are drawn as ellipses and include the alpha, beta, and size of the cluster. Edges show the cluster intercorrelations.

It is possible to trim the output to not show all cluster information. Clusters < min.size are shown as small ovals without alpha, beta, and size information.

Value

Output is a set of dot commands written either to console or to the output file. These commands may then be used as input to any "dot" viewer, e.g., Graphviz.

ICLUST.rgraph is a version of ICLUST.graph that uses Rgraphviz to draw on the screen as well.

Additional output is drawn to main graphics screen.

Note

Requires Rgraphviz

Author(s)

revelle@northwestern.edu
http://personality-project.org/revelle.html

References

ICLUST: http://personality-project.org/r/r.iclust.html

See Also

VSS.plot, ICLUST

Examples

test.data <- Harman74.cor$cov
ic.out <- ICLUST(test.data)   #uses iclust.diagram instead 

[Package psych version 1.4.5 Index]