Test Variables (contd)

• Queries

  • Short (S) - 1 or 2-phrase description of information need
  • Terse (T) - keyword list

• Non-Lexical Information

  • Default - Could make use of automatically-recognized features
  • None (N) - no non-lexical information (control)

• Recognition language models

  • Fixed (FLM) - Fixed language model/vocabulary predating test epoch
  • Rolling (RLM) - Time-adaptive language model/vocabulary using daily newswire texts

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