L33 Psych 301 Lecture 5: Chapter 5 Lecture Notes
Document Summary
Reliability of measures: true score & measurement error, assessment of reliability (assessment of) construct validity of measures, 6 more types of validity. Variables and measurement scales: nominal, ordinal, interval, ratio. Reliability of correlations: reliability of measures affects maximum correlation, restriction of range attenuation, large gap in range exaggeration, floor & ceiling effects attenuation, nonlinear relationship misrepresentation, erroneous. Above picture is a perfect example of reliable and unreliable measures. Sometimes the sad thing is, that you can get a really quick measure of something like iq only it"s not reliable, so it"s not as helpful. You want your findings, your p-value, to be greater than or equal to 0. 80. The correlation of a score at time 1 with the score at time. 2 represents test-retest reliability called alternate forms reliability when two forms of the measure are used. Correlation of each item on the measure with every other item on the measure is the.
