R: Test Data Generator for W-NOMINATE

generateTestData {wnominate}

R Documentation

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

`votes`	n x m vote matrix in 0/1/NA format.
`n`	integer, number of legislators.
`m`	integer, number of roll call votes.
`lopsided`	logical vector of length `m` indicating dropped vote. This is recomputed in `wnominate` and is never used.
`legis.data`	matrix, user-supplied data on legislators, containing data from an ORD file. Legislator names are rownames to this matrix.
`vote.data`	user-supplied data on rollcall votes, set to NULL.
`desc`	user-supplied description, set to NULL.

Author(s)

Keith Poole ktpoole@uga.edu

Jeffrey Lewis jblewis@ucla.edu

James Lo lojames@usc.edu

Royce Carroll rcarroll@rice.edu

Examples

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

[Package wnominate version 1.4 Index]