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Tests, reliability and validity, remember the voicethread questions too!
content validity
is the content of the test valid for the kind of test it is?
concurrent validity
two tests are measured at the same time
predictive validity
two measures are related in the future (GRE and success in graduate school)
convergent validity
e.g., if your test measures depression, it should relate to other measures with depression
discriminant validity
looking to find little or no relationship between your test and measures of construct that are not theoretically related to your test
test-retest reliability
giving the same test twice to the same group of people
alternate form reliability
similar to test-retest reliability, but with a different test/measure
Cronbach’s alpha
reliability associated with split-half reliability
internal consistency
how individual items relate to each other -- correlation coefficient for every possible split
percentile rank
percentage of people falling below an obtained score and ranges from 1 to 99
standard score
different kinds of scores that are derived by converting an individual’s raw score to a new score that has a new mean and new standard deviation
standard error of measurement
where we would expect a person’s score to fall if they took the instrument over and over again
Note
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