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Deriving Ideal Points. Optimal Classification Step1: find optimal cut points Nunn Helms Gore Kerry Dole B-2 N N N Y N Cambodia Y Y N N Y Tower N Y N N Y MLK N Y N N N | B-2. Classification Errors 1.

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Presentation Transcript
Deriving ideal points
Deriving Ideal Points

  • Optimal Classification

    • Step1: find optimal cut points

      Nunn Helms Gore Kerry Dole

      B-2 N N N Y N

      Cambodia Y Y N N Y

      Tower N Y N N Y

      MLK N Y N N N

      |

      B-2

Classification

Errors

1


Deriving ideal points1
Deriving Ideal Points

  • Optimal Classification

    • Step2: move Senators to Reduce Error

      Nunn Helms Dole Gore Kerry

      B-2 N N N N Y

      Cambodia Y Y Y N N

      Tower N Y Y N N

      | |

      Cambodia B-2

      Tower

      MLK

Classification

Errors

0

0

1


Deriving ideal points2
Deriving Ideal Points

  • Optimal Classification

    • Repeat Step1: find optimal cut points.

      Helms Dole Nunn Gore Kerry

      B-2 N N N N Y

      Cambodia Y Y Y N N

      Tower Y Y N N N

      MLK Y N N N N

      | |

      Cambodia B-2

      Tower

      MLK

Classification

Errors

0

1

0

1


Deriving ideal points3
Deriving Ideal Points

  • Optimal Classification

    • Repeat Step1: find optimal cut points.

      Helms Dole Nunn Gore Kerry

      B-2 N N N N Y

      Cambodia Y Y Y N N

      Tower Y Y N N N

      MLK Y N N N N

      | | |

      Cambodia B-2

      Tower

      MLK

Classification

Errors

0

0

0

1


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