Reliability and Validity
Measurement Methods
Measurement
Levels of measurement
Levels of Measurement
Levels of Measurement
MISC
100
Measuring what is desired rather than something else.
What is Validity?
100
Biophysical (e.g., using cuff and stethoscope)
What are physiological measurements?
100
Any deviation from the true value.
What is measurement error?
100
Distance is meaningful
What is interval?
100
Numerical distances between intervals
What is an interval scale?
200
Usually expressed as Cronbach’s a, although sometime kappa and r are used. They are interpreted the same way: If over 0.70, "what" is adequate.
What is reliability?
200
Hours of sleep, pain, nausea, dizziness, indigestion, hot flashes, tinnitus, fatigue, and dyspnea.
What are self- report measurements?
200
Tends to be used when a measurement is assumed to be far from perfect.
What is score?
200
Attributes can be ordered.
What is ordinal?
200
Order/ranking imposed on categories
What is an ordinal scale?
300
For a measurement to be trustworthy, good "what" and "what" are both needed.
What is reliability and validity?
300
Used when subjects cannot self-report accurately or dependably, or as a complementary double-check for real-time self-report.
What is physiological measures by observation?
300
True score + Measurement error.
What is observed score?
300
Absolute zero
What is ratio?
300
Useful for values that change frequently and exhibit a wide range.
What is physiological measures across time?
400
50%-70%
What is poor measurement reliability?
400
Concentration of substances in: body fluids, Tissue, genes.
What are physiological measures from laboratory tests?
400
One without the other does not enable you see
whether you have a .
What is trustworthy measurement?
400
Attributes to only named: weakest.
What is nominal?
400
Useful when observation is impractical or subjective.
What is obtaining physiological measures by Self-Report?
500
Over40%- Large, 20-30% -Medium, 5-20% - Low and under 5% -Negligible
What is the Cohen Criteria?
500
Automatic recordings of vital signs, EKGs
What are physiological measures through electronic monitoring?
500
The variation in measurement is in the same direction.
What is systematic error?
500
What are examples of nominal data?
500
Useful when observation is impractical or subjective.
What is obtaining physiological measures by Self-Report?