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Definition
Refers to consistency or stability of the measure
Must work exact same way each time it is used to be reliable |
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Error from the experimenter and testing situation or design |
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What are errors in measurment? |
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Error from the subject
examples...Giving wrong information (faking good or bad), forgetting events |
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What is an observed score? |
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Observed score = true score + measurement error |
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What is the formula for Reliability? |
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True Score
__________
True score + error score
No error...Reliability = 1 or -1 |
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What is a correlation coefficient? |
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Value that indicates the strength of the relationships between two variables
ex) hours watching tv correlates with hours playing video games
r score range from -1.00 to + 1.00
further from 0 = stronger correlation
closer to 0 = weaker correlation |
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Define test/retest reliability
What are problems associated with test/retest |
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Test people twice to see if their scores are stable
reliable test scores should be the same each time they are measure
Practice effects - people get better at answering the questions the second time around, so the correlation gets weakended
short interval - if the time between completing the measure is short, people might remember how they responded to the questions
(tests their memory, not reliability of the measure |
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Define alternate forms reliability |
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two different alternative froms tests
Tests are equivalent |
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Term
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Split items on a measure in half and correlate the two halves
total 50 items
randomly split the scale in half (25 & 25)
Internal reliability not reliability over time |
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To test for reliability of observation methods you can look at the correlation between observational scores made by one person with another person
number of agreements
x100
number of possible agreements
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Definition
| Degree to which a measure assesses what it is supposed to assess |
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Definition
The measure contains a good sample of items that are representative of the construct
consulting with experts and thorough review of the literature to make sure construct is represented well by the items
example) depression -- need to make sure you don't just ask about behaviors but questions about thoughts and feelings about depression too |
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| The Psychological measure is capable of prediciting actual behavior |
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Refers to the degree in which the measure assesses the psychological construct (how well)
For example the measure on depression should have a strong correlation with the Beck Depression Inventory, and a weak correlation with a measure of anxiety |
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