wnominate (version 1.4)

nomprob: NOMINATE Probability Matrix Generator

Description

nomprob takes estimates from the W-NOMINATE model and returns a matrix of yea choice probabilities. It is used to generate a test rollcall object using generateTestData.

Usage

nomprob(yea, nay, ideal, Beta, dimweight, normal=1)

Value

An n x m matrix of probabilities giving the probability of yea for each of n legislators on each of m votes

Arguments

For items below, m is the number of roll calls, n the number of legislators, and d the number of dimensions.

yea

m x d matrix of yea locations.

nay

m x d matrix of no locations.

ideal

n x d matrix of legislator ideal points.

Beta

scalar giving beta parameter from W-NOMINATE. Usually set to 15.

dimweight

d x 1 vector of dimension weights. Usually set to 0.5.

normal

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

Author

Keith Poole

Jeffrey Lewis

James Lo

Royce Carroll

See Also

'generateTestData' and 'wnominate'.

Examples

    yp <- matrix(rep(0,10),nrow=10)
    np <- matrix(rep(0.1,10),nrow=10)
    ideal <- matrix(rep(0,10),nrow=10)
    nomprob(yp,np,ideal,15,0.5)    #a matrix of yea probabilities