convertRC: Convert Roll Call Matrix Format

Description Usage Arguments Value Author(s) References See Also Examples

View source: R/convertRC.R

Description

convertRC takes a rollcall object and converts it into a format suitable for estimation with 'binIRT'.

Usage

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  convertRC(.rc, type = "binIRT") 

Arguments

.rc

a rollcall object containing votes to be scaled using 'binIRT'.

type

string, only “binIRT” is supported for now, and argument is ignored.

Value

An object of class rollcall, with votes recoded such that yea=1, nay=-1, missing data = 0.

Author(s)

Kosuke Imai [email protected]

James Lo [email protected]

Jonathan Olmsted [email protected]

References

Kosuke Imai, James Lo, and Jonathan Olmsted “Fast Estimation of Ideal Points with Massive Data.” Working Paper. Available at http://imai.princeton.edu/research/fastideal.html.

See Also

'binIRT', 'makePriors', 'getStarts'.

Examples

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## Data from 109th US Senate
data(s109)

## Convert data and make starts/priors for estimation
rc <- convertRC(s109)
p <- makePriors(rc$n, rc$m, 1)
s <- getStarts(rc$n, rc$m, 1)

## Conduct estimates
lout <- binIRT(.rc = rc,
                .starts = s,
                .priors = p,
                .control = {
                    list(threads = 1,
                         verbose = FALSE,
                         thresh = 1e-6
                         )
                }
                )

## Look at first 10 ideal point estimates
lout$means$x[1:10]

emIRT documentation built on May 29, 2017, 7:10 p.m.