Measurement Reliability and Validity - PowerPoint PPT Presentation

Loading...

PPT – Measurement Reliability and Validity PowerPoint presentation | free to view - id: 169bb2-ZDc1Z



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

Measurement Reliability and Validity

Description:

Measurement Reliability and Validity – PowerPoint PPT presentation

Number of Views:60
Avg rating:3.0/5.0
Slides: 16
Provided by: michael586
Category:

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Measurement Reliability and Validity


1
Measurement Reliability and Validity
(Click icon for audio)
2
Sources of Measurement Differences M A
E where M measurement A true
indicator E random or
systematic error
3
Reliability
  • Degree to which measures are free from random
    error and therefore yield consistent results

4
(No Transcript)
5
Validity
  • Ability of a scale to measure what was intended
    to be measured

6
(No Transcript)
7
Validity versus Reliability
Validity
Reliability
8
Rulers are Reliable and Valid
9
(No Transcript)
10
Causes of Variation in Scale Measurements
  • True differences in the characteristic being
    measured
  • Differences due to stable characteristics of
    individual respondents
  • e.g., intelligence, education
  • Differences due to short-term personal factors
  • e.g., health, fatigue, motivation
  • Differences caused by situational factors
  • e.g., rapport with interviewer, distractions
  • Differences resulting from variations in
    administering the survey
  • e.g., different interviewers
  • Differences due to the sampling of items
    included in the questionnaire
  • Differences due to a lack of clarity in the
    measurement instrument
  • e.g., ambiguity, complexity, interpretation
  • Differences due to mechanical or instrument
    factors
  • e.g., lack of space to record response,
    appearance of questionnaire
  • Differences in scoring/coding responses

11
Scale Evaluation
12
Approaches to Reliability Assessment
  • Test-retest
  • Split sample
  • Alternative forms
  • Internal comparison
  • Inter-scorer

13
Approaches to Validity Assessment
  • Content/face
  • Predictive/criterion
  • Convergent
  • Divergent
  • Nomological

14
(No Transcript)
15
Sensitivity
  • Measurement instruments ability to accurately
    measure variability in stimuli or responses
About PowerShow.com