Description Usage Arguments Value Author(s) See Also Examples

`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.

1 2 3 4 5 |

`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. |

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 |

`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. |

Keith Poole ktpoole@uga.edu

Jeffrey Lewis jblewis@ucla.edu

James Lo lojames@usc.edu

Royce Carroll rcarroll@rice.edu

'wnominate', 'nomprob'.

1 2 3 4 | ```
dat<-generateTestData()
result<-wnominate(dat,polarity=c(1,2))
summary(result)
plot(result)
``` |

```
Loading required package: pscl
Classes and Methods for R developed in the
Political Science Computational Laboratory
Department of Political Science
Stanford University
Simon Jackman
hurdle and zeroinfl functions by Achim Zeileis
## W-NOMINATE Ideal Point Package
## Copyright 2006 -2020
## Keith Poole, Jeffrey Lewis, James Lo, and Royce Carroll
## Support provided by the U.S. National Science Foundation
## NSF Grant SES-0611974
Preparing to run W-NOMINATE...
Checking data...
All members meet minimum vote requirements.
All votes meet minimum lopsidedness requirement.
Running W-NOMINATE...
Getting bill parameters...
Getting legislator coordinates...
Starting estimation of Beta...
Getting bill parameters...
Getting legislator coordinates...
Starting estimation of Beta...
Getting bill parameters...
Getting legislator coordinates...
Getting bill parameters...
Getting legislator coordinates...
Estimating weights...
Getting bill parameters...
Getting legislator coordinates...
Estimating weights...
Getting bill parameters...
Getting legislator coordinates...
W-NOMINATE estimation completed successfully.
W-NOMINATE took 0.786 seconds to execute.
SUMMARY OF W-NOMINATE OBJECT
----------------------------
Number of Legislators: 20 (0 legislators deleted)
Number of Votes: 100 (0 votes deleted)
Number of Dimensions: 2
Predicted Yeas: 908 of 958 (94.8%) predictions correct
Predicted Nays: 999 of 1042 (95.9%) predictions correct
Correct Classifiction: 93.85% 95.35%
APRE: 0.861 0.895
GMP: 0.867 0.901
The first 10 legislator estimates are:
coord1D coord2D
Legislator1 0.977 0.215
Legislator2 -0.953 -0.302
Legislator3 0.976 -0.217
Legislator4 -0.907 -0.421
Legislator5 -0.738 -0.258
Legislator6 -0.948 0.236
Legislator7 0.996 0.050
Legislator8 0.800 -0.113
Legislator9 0.972 -0.016
Legislator10 -0.973 0.202
NULL
```

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