path.diagram {sem} | R Documentation |
path.diagram
creates a description of the path diagram
for a structural-equation-model object to be processed by the
graph-drawing program dot; see Koutsofios and North (2002)
and http://www.graphviz.org/.
path.diagram(model, ...) ## S3 method for class 'sem': path.diagram(model, out.file, min.rank=NULL, max.rank=NULL, same.rank=NULL, variables=model$var.names, parameters=rownames(model$ram), ignore.double=TRUE, edge.labels=c("names", "values"), size=c(8, 8), node.font=c("Helvetica", 14), edge.font=c("Helvetica", 10), rank.direction=c("LR", "TB"), digits=2, ...)
model |
a structural-equation-model object produced by sem . |
... |
arguments to be passed down to path.diagram.sem . |
out.file |
a file to which to write the dot description of the path diagram; if not specified, the description is written to standard output (normally the R Console). |
min.rank |
a character string listing names of variables to be assigned minimum rank (order) in the graph; the names should be separated by commas. |
max.rank |
a character string listing names of variables to be assigned maximum rank in the graph; the names should be separated by commas. |
same.rank |
a character string or vector of character strings of variables to be assigned equivalent rank in the graph; names in each string should be separated by commas. |
variables |
variable names; defaults to the variable names in model .
If specified, the variable names should be in the same order as in model . |
parameters |
parameter names; defaults to the parameter names in
model . If specified, the parameter names should be in the same order
as in model . |
ignore.double |
if TRUE , the default, double-headed arrows, representing
variances and covariances, are not graphed. |
edge.labels |
"names" to label arrows with parameter names;
"values" to label arrows with parameter estimates. |
size |
the size of the graph, in inches. |
node.font |
font name and point-size for printing variable names. |
edge.font |
font name and point-size for printing arrow names or values. |
rank.direction |
draw graph left-to-right, "LR" , the default,
or top-to-bottom, "TB" . |
digits |
number of digits after the decimal point (default, 2) to which to round parameter estimates. |
NULL
: path.diagram
is used for its side-effect, producing a
graph description of the model.
John Fox jfox@mcmaster.ca
Koutsofios, E., and North, S. C. (2002) Drawing graphs with dot. http://www.graphviz.org/Documentation/dotguide.pdf.
# The Duncan, Haller, and Portes Peer-Influences Model R.DHP <- read.moments(diag=FALSE, names=c('ROccAsp', 'REdAsp', 'FOccAsp', 'FEdAsp', 'RParAsp', 'RIQ', 'RSES', 'FSES', 'FIQ', 'FParAsp')) .6247 .3269 .3669 .4216 .3275 .6404 .2137 .2742 .1124 .0839 .4105 .4043 .2903 .2598 .1839 .3240 .4047 .3054 .2786 .0489 .2220 .2930 .2407 .4105 .3607 .0186 .1861 .2707 .2995 .2863 .5191 .5007 .0782 .3355 .2302 .2950 .0760 .0702 .2784 .1988 .1147 .1021 .0931 -.0438 .2087 model.dhp <- specify.model() RParAsp -> RGenAsp, gam11, NA RIQ -> RGenAsp, gam12, NA RSES -> RGenAsp, gam13, NA FSES -> RGenAsp, gam14, NA RSES -> FGenAsp, gam23, NA FSES -> FGenAsp, gam24, NA FIQ -> FGenAsp, gam25, NA FParAsp -> FGenAsp, gam26, NA FGenAsp -> RGenAsp, beta12, NA RGenAsp -> FGenAsp, beta21, NA RGenAsp -> ROccAsp, NA, 1 RGenAsp -> REdAsp, lam21, NA FGenAsp -> FOccAsp, NA, 1 FGenAsp -> FEdAsp, lam42, NA RGenAsp <-> RGenAsp, ps11, NA FGenAsp <-> FGenAsp, ps22, NA RGenAsp <-> FGenAsp, ps12, NA ROccAsp <-> ROccAsp, theta1, NA REdAsp <-> REdAsp, theta2, NA FOccAsp <-> FOccAsp, theta3, NA FEdAsp <-> FEdAsp, theta4, NA sem.dhp <- sem(model.dhp, R.DHP, 329, fixed.x=c('RParAsp', 'RIQ', 'RSES', 'FSES', 'FIQ', 'FParAsp')) path.diagram(sem.dhp, min.rank='RIQ, RSES, RParAsp, FParAsp, FSES, FIQ', max.rank='ROccAsp, REdAsp, FEdAsp, FOccAsp') ## digraph "sem.dhp" { ## rankdir=LR; ## size="8,8"; ## node [fontname="Helvetica" fontsize=14 shape=box]; ## edge [fontname="Helvetica" fontsize=10]; ## center=1; ## {rank=min "RIQ" "RSES" "RParAsp" "FParAsp" "FSES" "FIQ"} ## {rank=max "ROccAsp" "REdAsp" "FEdAsp" "FOccAsp"} ## "RGenAsp" [shape=ellipse] ## "FGenAsp" [shape=ellipse] ## "RParAsp" -> "RGenAsp" [label="gam11"]; ## "RIQ" -> "RGenAsp" [label="gam12"]; ## "RSES" -> "RGenAsp" [label="gam13"]; ## "FSES" -> "RGenAsp" [label="gam14"]; ## "RSES" -> "FGenAsp" [label="gam23"]; ## "FSES" -> "FGenAsp" [label="gam24"]; ## "FIQ" -> "FGenAsp" [label="gam25"]; ## "FParAsp" -> "FGenAsp" [label="gam26"]; ## "FGenAsp" -> "RGenAsp" [label="beta12"]; ## "RGenAsp" -> "FGenAsp" [label="beta21"]; ## "RGenAsp" -> "ROccAsp" [label=""]; ## "RGenAsp" -> "REdAsp" [label="lam21"]; ## "FGenAsp" -> "FOccAsp" [label=""]; ## "FGenAsp" -> "FEdAsp" [label="lam42"]; ## }