Capture rate for the number of kinds of ideas in free descriptions using the DeLury method: Application to university class evaluations

Kotaro Ohashi, Hideki Toyoda, Kazuya Ikehara

Research output: Contribution to journalArticle


In the present study, a calculation method was suggested for capture rate, which is an index that stands for the number of kinds of ideas that have been collected in free description data. The DeLury method, a popular calculation method for estimating biological populations, was used to calculate a parameter that estimated the number of kinds of ideas. In addition, by using phantom variables, it was shown that this method can be used in structural equation modeling. Free description data from a university class evaluation coded by the KJ method were used for the analysis, and the capture rate was calculated. The results indicated that this his method revealed more than 80% of the kinds of ideas.

Original languageEnglish
Pages (from-to)13-22
Number of pages10
JournalJapanese Journal of Educational Psychology
Issue number1
Publication statusPublished - 2015



  • Capture rate
  • Class evaluation
  • DeLury method
  • Free description
  • KJ method

ASJC Scopus subject areas

  • Developmental and Educational Psychology
  • Education

Cite this