sna (version 2.7)

plot.qaptest: Plotting for qaptest Objects

Description

Plots the Distribution of a QAP Test Statistic.

Usage

# S3 method for qaptest
plot(x, mode="density", ...)

Value

None

Arguments

x

A qaptest object

mode

``density'' for kernel density estimation, ``hist'' for histogram

...

Additional arguments to plot

Author

Carter T. Butts

Details

In addition to the quantiles associated with a QAP test, it is often useful to examine the form of the distribution of the test statistic. plot.qaptest facilitates this.

References

Hubert, L.J., and Arabie, P. (1989). ``Combinatorial Data Analysis: Confirmatory Comparisons Between Sets of Matrices.'' Applied Stochastic Models and Data Analysis, 5, 273-325.

Krackhardt, D. (1987). ``QAP Partialling as a Test of Spuriousness.'' Social Networks, 9 171-186.

Krackhardt, D. (1988). ``Predicting With Networks: Nonparametric Multiple Regression Analyses of Dyadic Data.'' Social Networks, 10, 359-382.

See Also

qaptest

Examples

#Generate three graphs
g<-array(dim=c(3,10,10))
g[1,,]<-rgraph(10)
g[2,,]<-rgraph(10,tprob=g[1,,]*0.8)
g[3,,]<-1; g[3,1,2]<-0              #This is nearly a clique

#Perform qap tests of graph correlation
q.12<-qaptest(g,gcor,g1=1,g2=2)
q.13<-qaptest(g,gcor,g1=1,g2=3)

#Examine the results
summary(q.12)
plot(q.12)
summary(q.13)
plot(q.13)