Corpus Construction

LABELING EFFORT

• Hand correction of automatically (HMM) pre-aligned labels by 7 naive labelers trained for this specific task

  Optimum labeling speed reached after 40 hours of transcription
  Top speed was 1 +/­ 0.2 words per minute

• Version management using CVS over internet

• Total amount of labeling work:

  50,000 words and 200,000 segment boundaries

• Total time of labeling:

  1000 hours (manual labeling)
  6 person-months (staff-time overhead etc.)

• Average labeling speed:

  0.84 words / minute
  3.3 boundaries / minute
  Without pre-alignment, labeling speed approximately halves

• Monetary cost of alignment:

  (excluding VAT, automatic and manual alignment combined)
  DFl 74,000 Total (= 33,597 Euro)
  DFl 1.40 / word (= 0.65 Euro / word)
  DFl 0.37 / boundary (= 0.17 Euro / boundary)