STANDARD ERROR OF MEASUREMENT (SEM) Flashcards
the most influential theory to help understand
measurement issues
Classical Test Theory
True Score Theory
Charles Spearman laid the groundwork for
Classical Test Theory
True Score Theory
he laid the groundwork for Classical Test Theory
Charles Spearman
Difference between an individual’s obtained and true score
MEASUREMENT ERROR
is typically considered the largest source of error in test scores
Content Sampling Error
it allows us to quantify the extent to
which a “test” provides accurate scores.
SEM
LOW levels of standard error of
measurement indicate
high levels of
precision or consistency
HIGH levels of standard error of measurement
indicate
low levels of score precision or consistency
reflects a range of scores that will contain the
individual’s true score with a prescribed probability
CONFIDENCE INTERVALS
SEM formula
SEM= SD 1 − rxx
68% CI
68% CI= Score ± SEM
95 % CI
95 % CI= Score ± (1.96 *SEM)
99% CI
99% CI= Score ± (2.58*SEM)
