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Chapter 5: Measurement Concepts (Reliability (Measure (True Score:…
Chapter 5: Measurement Concepts
Reliability
To understand what is reliable
Consistent measures a behavior
The same results when the test is administered multiple times
the amount taken is averaged out
Measure
True Score: measurement error
the real score of the variable
Reliability of Measures
must use a reliable measure
Must be a reliable measure
Assess Reliability
Pearson product-moment correlation coefficent
-1 to 0 to 1
If it's 0 then there is not reliable
Test-Retest Reliability
alternate forms reliability
same test administred 2 times
two points of time
same indvidual
Internal Consistency reliability
responses at one point
item-total correlations: all items are talking about the same subject
split-half reliability
Inter-rater reliability
accuracy between raters
most times is having raters together and talking about the scores - there examples and shown how to it
there are trainings about what you are measuring and how to measure it
measured through percentage of inter-rater reliability
because you need to find the statistical significance.
construct validity of measures
face validity
content validity