psych (version 1.0-80)

dia.rect: Helper functions for drawing path model diagrams

Description

Path models are used to describe structural equation models or cluster analytic output. These functions provide the primitives for drawing path models. Used as a substitute for some of the functionality of Rgraphviz.

Usage

dia.rect(x, y = NULL, labels = NULL,  cex = 1,  xlim = c(0, 1), ylim = c(0, 1), ...)
 dia.ellipse(x, y = NULL, labels = NULL, cex=1,e.size=.05, xlim=c(0,1), ylim=c(0,1),  ...) 
dia.ellipse1(x,y,segments=51,e.size=.05,xlim=c(0,1),ylim=c(0,1),...)
dia.arrow(from,to,labels=NULL,scale=1,radius1=0,radius2=0,cex=1,...)
dia.curve(from,to,labels=NULL,scale=1,...)
dia.self(location,labels=NULL,scale=.8,side=2,...)

Arguments

x

x coordinate of a rectangle or ellipse

y

y coordinate of a rectangle or ellipse

radius1

start the arrows at the endpoint - radius1

radius2

stop the arrows at the endpoint - radius2

e.size

The size of the ellipse (scaled by the number of variables

labels

Text to insert in rectangle, ellipse, or arrow

cex

adjust the text size

segments

precision with which to drawn the ellipses

scale

modifies size of rectangle and ellipse

from

arrows and curves go from

to

arrows and curves go to

location

where is the rectangle?

xlim

default ranges

ylim

default ranges

side

Which side of boxes should errors appear

...

Most graphic parameters may be passed here

Value

• Graphic output

Details

These functions are the graphic primitives used by fa.diagram, omega.diagram, and ICLUST.diagram. They create rectangles or ellipses surrounding text, connect them to straight or curved arrows, and can draw an arrow from and to the same rectangle.

Each elipse and rectangle has a left, right, top and bottom coordinate that is used to connect the arrows.

These functions were developed to get around the infelicities associated with trying to install Rgraphviz and graphviz.

Better documentation will be added as these functions get improved. Currently the functions are just a work around for Rgraphviz.

See Also

fa.diagram, omega.diagram, and ICLUST.diagram.

Examples

v9 <- sim.hierarchical()
f3 <- fa(v9,3,rotate="cluster")
fa.diagram(f3,error=TRUE,side=3)