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')

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.

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.

Author

Keith Poole ktpoole@uga.edu

Jeffrey Lewis jblewis@ucla.edu

James Lo lojames@usc.edu

Royce Carroll rcarroll@rice.edu

Examples

Run this code

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