TOEFL Synonym Questions (State of the art)

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  • Test of English as a Foreign Language
  • 80 multiple-choice synonym questions
  • introduced in Landauer and Dumais (1997)
  • subsequently used by many other researchers


Reference for algorithm Reference for experiment Type of algorithm Percent correct 95% confidence
Resnik 1995 Jarmasz and Szpakowicz 2003 hybrid 20.31% 12.89–31.83%
Leacock and Chodrow 1998 Jarmasz and Szpakowicz 2003 lexicon-based 21.88% 13.91–33.21%
Lin 1998 Jarmasz and Szpakowicz 2003 hybrid 24.06% 15.99–35.94%
Jiang and Conrath 1997 Jarmasz and Szpakowicz 2003 hybrid 25.00% 15.99–35.94%
Landauer and Dumais 1997 Landauer and Dumais 1997 corpus-based 64.38% 52.90–74.80%
Average non-English US college applicant Landauer and Dumais 1997 human 64.50% 53.01–74.88%
Turney 2001 Turney 2001 corpus-based 73.75% 62.71–82.96%
Hirst and St.-Onge 1998 Jarmasz and Szpakowicz 2003 lexicon-based 77.91% 68.17–87.11%
Jarmasz and Szpakowicz 2003 Jarmasz and Szpakowicz 2003 lexicon-based 78.75% 68.17–87.11%
Terra and Clarke 2003 Terra and Clarke 2003 corpus-based 81.25% 70.97–89.11%
Rapp 2003 Rapp 2003 92.50% ?
Turney et al. 2003 Turney et al. 2003 hybrid 97.50% 91.26–99.70%


  • 95% confidence interval calculated using Binomial Exact Test