Reliability and Validity in Research....,

Reliability and Validity in Research....,

1. RELIABILITY & VALIDITY

2. RELIABILITY The extent to which repeated measurements agree with one another. Also referred to as “stability”, “consistency” and “reproducibility” .

3. validity The ability of a measure to capture what it is intended to measure.

4. Slide Title

5. TYPES OF VALIDITY FACE CONTENT CONSTRUCT CRITERION

6. FACE VALIDITY The degree to which an instrument appears to measure what it is designed to measure. A test can be said to have face validity if it "looks like" it is going to measure what it is supposed to measure.

7. CONTENT VALIDITY Examines if the items within an instrument adequately comprise the entire content of a given domain reported to be measured by the instrument.

8. Construct VALIDITY Degree to which an instrument can justify the operational definition of the concept or construct.

9. CRITERION VALIDITY It reflects the degree to which its scores are related to the scores of reference standard (gold standard) instrument.

10. TYPES OF RELIABILITY Test-retest Internal consistency rater

11. REPRODUCIBILITY The stability of a measure as it is repeated over time. For e.g. measurement of elbow flexion on two separate occasions on the same subject give same measure in degrees.

12. INTERNAL CONISITENCY A measure based on the correlations between different items on the same test. Measures whether several items that propose to measure the same general construct produce similar scores.

13. RATER Inter-rater Reliability. Intra-rater Reliability.

14. RATER INTRA-RATER RELIABILITY : The consistency of repeated measures performed by one individual.

15. RATER INTER-RATER RELIABILITY : The degree of agreement among raters. It is a score of how much homogeneity or consensus exists in the ratings given by various judges.