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Validity & Reliability of measurement tool-

Understand the importance of validity and reliability in research measurement tools, exploring methods for establishing validity and reliability estimates.

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Validity & Reliability of measurement tool-

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  1. PPTs for teaching & learning for course BUSINESS RESEARCH METHODSMBA Sem ISavitribaiPhule Pune University, Pune, India.By Prof. SwapnilUndale & Dr. PadmavatiUndale This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License. You are free touse, distribute and modify it, including for commercial purposes, provided you acknowledgethe source and share-alike. To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/4.0/.

  2. Validity & Reliability of measurement tool- As researcher we need to develop or select measurement tool for the purpose of our research. The tool should be valid, reliable and practicable. Validity- Extent to which a test measures what we actually want to measure Reliability- The accuracy and precision of a measurement procedure

  3. Validity & Reliability of measurement tool- 2 3 5 4 1 2.5 Kg 2.5 Kg 2.5 Kg 2.5 Kg 2.5 Kg High Reliability- High Validity

  4. Validity & Reliability of measurement tool- 2 3 5 4 1 17.5 Kg 17.5 Kg 17.5 Kg 17.5 Kg 17.5 Kg High Reliability- Low Validity

  5. Validity & Reliability of measurement tool- 2 3 5 4 1 2.7 Kg 2.6 Kg 2.5 Kg 2.7 Kg 2.3 Kg Low Reliability- High Validity

  6. Validity & Reliability of measurement tool- 2 3 5 4 1 21.5 Kg 2.6 Kg 12.5 Kg 8.4 Kg 4.3 Kg Low Reliability- Low Validity

  7. METHODS FOR VALIDITY ESTIMATES • Content Validity • Criterion validity • Construct Validity

  8. Validity types- Content validity- Degree to which the content of the items adequately represents the universe of all relevant items under study. Whether samples are true representatives of population/universe?

  9. Validity types- Criterion validity- Extent to which each criteria can be correctly measured. E.g. family income Construct validity- Construct validity refers to whether a scale or test measures the construct adequately. e.g. Doctor measuring effect of painkiller, Try to assess the level of pain each day by asking question to his patients to rate pain on 1-10 scale. Whether he is measuring pain or numbness?

  10. METHODS FOR RELIABILITY ESTIMATES Test – retest : • Implement the measuring instrument at two separate times for each subject • Compute the correlation between the two separate measurements • Assume that there is no change in the underlying conditions between the two separate measurements.

  11. METHODS FOR RELIABILITY ESTIMATES Internal consistency : Two sets of questions aimed at measuring the same concept are administered to the same respondent and correlation is found out.

  12. THANK YOU

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