Percent Diacritics Correct (PDC)

The Percent Diacritics Correct (PDC) analysis compares the diacritics on aligned IPA Target and IPA Actual phones and reports the percentage of target diacritics produced correctly. Only the diacritics are compared; the base phone is ignored.

The generated report includes a Readme section summarising the analysis, per-speaker and global summary tables, IPA pattern tables, and a listing of all results.

Data Preparation

Session data is queried by word for each IPA Target and IPA Actual tuple. Proper syllabification and phone alignment is required for accurate results. All participants should have unique names/identification numbers and a speaker should be assigned to all records.

Parameters

Figure 1. Percent Diacritics Correct Parameters


The PPC report can be restricted to different sets of phones. The following pre-defined report types are available
  1. All phones
  2. Consonants
  3. Vowels
  4. Other (custom)
When 'Other (custom)' is selected a custom Phonex expression may be entered to create a custom phone set. See Example Phones Queries for some useful examples.

PDC Calculation

PDC is calculated using the following equation:

PDC = correct(correct+incorrect) ×100 = correct(correct+deletions+substitutions+epenthesis) ×100

Report Outline

A sample table of contents is displayed below. Bold level elements are section headers while italic items are tables.

  • Percent Diacritics Correct (PDC)

    • Readme

    • Summary

      • All Participants

      • IPA Patterns

    • Participant 1
      • Summary
      • IPA Patterns
    • … (for each selected participant)

    • Listing (All Results)