Tests & Psychometrics Flashcards
Raw scores fit to distribution that transformed with mean = 50 and SD = 10.
T - Scores
Measurement of equality or sameness (E.g. number of rugby jersey’s)
Scale of measurement: Classification/categorization based on one or more distinguishing characteristics (e.g. DSM, Yes/no questions)
Nominal Level
Scale of measurement: Imply nothing about how much greater one ranking is than another; no absolute zero point (e.g. Binet intelligence test); cant be averaged
Ordinal Level
Scale of measurement: Equal intervals between numbers; no test-taker possess none of the ability or trait being measured; no absolute zero point; can be averaged
Interval Level
The usefulness or practical value that a test or other tool of assessment has for a particular purpose
Utility
Scale of measurement: Zero has meaning; assessment in neurological functioning
Ratio Level
Measure of central tendency: appropriate for interval or ratio data.
Mean
Measure of central tendency: Appropriate for ordinal, interval, ratio data.
Median
Measure of central tendency: most frequently occurring score in a distribution of scores.
Mode
Indication of how scores in a distribution are scattered or dispersed.
Variability
Simplifies the interpretation of individual scores on the test; both sides approach x-axis asymptotically.
The normal curve (laplace-gaussian curve)
Collective influence of all the factors on a test score or measurement beyond those specifically measured by the test or measurement.
Error
Arithmetic mean of the squares of the differences between the scores in a distribution and their mean; square and sum all deviation scored and divide by total number of scores.
Variance
Steep or peakness of a distribution of scores around the mean.
Kurtosis
Relatively flat curve.
Platykurtic
