Words and the Company they keep C(a,b) a b C(a,b) a b 11487 - - PowerPoint PPT Presentation

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Words and the Company they keep C(a,b) a b C(a,b) a b 11487 - - PowerPoint PPT Presentation

Mar 07, 2024 130 likes •1.3k views

Words and the Company they keep C(a,b) a b C(a,b) a b 11487 New York 80871 of the 7261 United Sates 58841 in th 5412 Los Angeles 26430 to the 3301 last year 21842 on the 3191 Saudi Arabia 21839 for the 2699

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Words and the Company they keep

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C(a,b) a b 80871

  • f

the 58841 in th 26430 to the 21842

  • n

the 21839 for the 18568 and the 16121 that the 15630 at the 15494 to be 13899 in a 13689

  • f

a 13361 by the C(a,b) a b 11487 New York 7261 United Sates 5412 Los Angeles 3301 last year 3191 Saudi Arabia 2699 last week 2514 vice president 2378 Persian Gulf 2161 San Francisco 2106 Presiden Bush 2001 Middle East 1942 Saddan Hussein

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Hypothesis Testing

  • Conclusions are about Ho
  • reject Ho in favour of H_1
  • do no reject Ho
  • we never can conclude
  • reject H_1, or even
  • accept H_1
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Results on an Hypothesis test

Decision Reject Ho Don’t reject Truth Ho Type I Error Righ Decision H_1 Righ Decision Type II Error

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Significance level

  • P(type I error) = significance level = α
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Mutual Information and Word Classes

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Markov Models

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HMM algorithms: Trellis and Viterbi

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Introduction to Parsing

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Treebanks, Evaluation

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PCFGs Introduction

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Statistical Parsing

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