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Measurement Validity and
Reliability for Research in
Audiology
 Validity- How to show that the test truly measures
what it claims.
 (Does it measure what it is suppose to measure)
 R...
Validity
 On a test with high validity the items will be closely
linked to the test’s intended focus.
 Example: One comm...
Several ways to estimate validity
 Content validity- related to objectives and their
sampling
 Construct validity- theor...
Validity vs. Reliability
 Measures of validity are similar to measures of
reliability. With reliability, you compare one
...
Reliability
 Reliability is the extent to which an experiment or
test shows the same result on repeated trails when
the s...
Tests that Validity vs Reliability Matter
 Acoustic Reflexes
 MRIs
 OAEs
 Vemp
 VNGs
 ABR
 ASSR
 EcochG
Reliability Example
 If your IQ was measured at 113 last week, Expect
nearly the same score if measured again this week.
Reliability and Error in Measurement
 Measured score = true score + error
 Example
 For an IQ test
 True score= actual...
Reliability
 Equivalency: related to the co-occurrence of two
items
 Stability: related to time consistency
 Internal: ...
Practice Quiz
 Reliability refers to whether we are truly measuring
the concept of interest in our study.
• True
• False
Practice Quiz
 Reliability refers to whether we are truly measuring
the concept of interest in our study.
• True
• False
Practice Quiz
 Researchers always try to maximize reliability and
validity in their research.
• True
• False
Practice Quiz
 Researchers always try to maximize reliability and
validity in their research.
• True
• False
Practice Quiz
 The validity of a measure refers to the:
a. comprehensiveness with which it
measures the construct.
b. par...
Practice Quiz
 The validity of a measure refers to the:
a. comprehensiveness with which it
measures the construct.
b. par...
References
 Cardozo, R., Magdalena, J., Validity, Reliability and Practicality Retrieved from
http://www.slideshare.net/s...
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Measurement validity and reliability

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Learn how to assess validity and reliability in audiology test. See what test is most effective.

Published in: Healthcare

Measurement validity and reliability

  1. 1. Measurement Validity and Reliability for Research in Audiology
  2. 2.  Validity- How to show that the test truly measures what it claims.  (Does it measure what it is suppose to measure)  Reliability- Produces stable, consistent measurements.  (How representative is the measurement)
  3. 3. Validity  On a test with high validity the items will be closely linked to the test’s intended focus.  Example: One common technique for demonstrating validity is to use correlation.  If test measures intelligence than it should related to IQ, performance on learning tasks, and problem-solving ability. If all test scores correlate then new test is valid
  4. 4. Several ways to estimate validity  Content validity- related to objectives and their sampling  Construct validity- theory underlying the target  Criterion related validity- concrete criteria in the real world  Concurrent- correlating with another measure already validated  Predictive- Capable of anticipating some later measure.  Face validity- related to test overall appearance
  5. 5. Validity vs. Reliability  Measures of validity are similar to measures of reliability. With reliability, you compare one measurement of a variable on a group of subjects with another measurement of the same variable on the same subjects. With validity, you also compare two measurements on the same subjects.
  6. 6. Reliability  Reliability is the extent to which an experiment or test shows the same result on repeated trails when the same individuals are measure under the same conditions.
  7. 7. Tests that Validity vs Reliability Matter  Acoustic Reflexes  MRIs  OAEs  Vemp  VNGs  ABR  ASSR  EcochG
  8. 8. Reliability Example  If your IQ was measured at 113 last week, Expect nearly the same score if measured again this week.
  9. 9. Reliability and Error in Measurement  Measured score = true score + error  Example  For an IQ test  True score= actual level of intelligence  Error = current mood, fatigue, general health, etc.
  10. 10. Reliability  Equivalency: related to the co-occurrence of two items  Stability: related to time consistency  Internal: related to the intruments
  11. 11. Practice Quiz  Reliability refers to whether we are truly measuring the concept of interest in our study. • True • False
  12. 12. Practice Quiz  Reliability refers to whether we are truly measuring the concept of interest in our study. • True • False
  13. 13. Practice Quiz  Researchers always try to maximize reliability and validity in their research. • True • False
  14. 14. Practice Quiz  Researchers always try to maximize reliability and validity in their research. • True • False
  15. 15. Practice Quiz  The validity of a measure refers to the: a. comprehensiveness with which it measures the construct. b. particular type of construct specification. c. consistency of the measurement. d. accuracy with which it measures the construct.
  16. 16. Practice Quiz  The validity of a measure refers to the: a. comprehensiveness with which it measures the construct. b. particular type of construct specification. c. consistency of the measurement. d. accuracy with which it measures the construct.
  17. 17. References  Cardozo, R., Magdalena, J., Validity, Reliability and Practicality Retrieved from http://www.slideshare.net/songoten77/presentation-validity-reliability on November 30, 2009  Gravetter, F., Wallnau, L. B., Essentials of Statistics for the Behavioral Sciences, 5th Edition, Thomson and Wadsworth, 2005  Writing Guides Reliabiltiy and Validity, Colorado State University, Retrieved from http://writing.colostate.edu/guides/research/relval/index.cfm on Nov. 30, 2009

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