wnominate (version 1.2)

generateTestData: Test Data Generator for W-NOMINATE

Description

generateTestData is the function that generates a rollcall object used to test wnominate. The description of the result below is copied from the documentation of package pscl, written by Simon Jackman.

Usage

generateTestData(legislators=20, rcVotes=100, yea=matrix(runif(rcVotes,min=-0.2,max=0.7),nrow=rcVotes), nay=matrix(runif(rcVotes,min=-0.7,max=0.2),nrow=rcVotes), ideal=matrix(rnorm(legislators),nrow=legislators), Beta=15, dimweight=0.5,normal=1, seed = NULL, utility='nominate')

Arguments

legislators

integer, number of Legislators ('n').

rcVotes

integer, number of roll calls ('m').

yea

an m x d matrix of yea locations, where 'd' are the number of dimensions.

nay

an m x d matrix of no locations, where 'd' are the number of dimensions.

ideal

an n x d matrix of legislator ideal points.

Beta

scalar giving beta parameter from W-NOMINATE.

dimweight

d x 1 vector of dimension weights.

normal

integer, '1' generates data using normal probabilities, any other value generates data using logistic probabilities.

seed

a single value, interpreted as an integer, used to set the seed. If seed is NULL, current seed is used.

utility

String set to either ``nominate'' or ``qn''. `nominate' allows NOMINATE logit or probit utilities, while ``qn'' allows for quadratic normal utilities to be used when generating the roll call matrix.

Value

An object of class rollcall

See Also

'wnominate', 'nomprob'.

Examples

    dat<-generateTestData()
    result<-wnominate(dat,polarity=c(1,2))
    summary(result)
    plot(result)