validity

• validity

  • measuring what you intend to measure
• types

  • internal - inside the study
  • external - ecological (consistent to all settings)
  • external - temporal (consistent over time)
  • external - population (consistent to different groups of people)
• ways to assess

  • face validity - a test looks like it tests what its meant to - ask an expert to check if it looks like it measures what it intends to
  • concurrent - whether findings are similar to those on an established test - scores need to have a coefficient of +0.80 to an established test
• ways to improve

  • questionnaires - ensure confidentiality so ppts are honest
  • observation - operationalise behaviour categories
  • experiments - use a control group and standardise
  • qualitative research - interpretive validity (directly quote from transcripts), triangulation (use a number of sources as evidence)