Flashcards in 5.1 Measurement Concepts – Reliability Deck (11)
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____ refers to the consistency or stability of a measure of behaviour.
Reliability
1
A reliable measure does not ____ from one reading to the next. If the measure does fluctuate, there is error in the measurement device.
fluctuate
2
Any measure that you make can be thought of as comprising two components: (1) a ____ ____, which is the real score on the variable, and (2) ____ ____.
true score, measurement error
3
The ____ ____ ____ (symbolised as r) can range from 0.00 to +1.00 and 0.00 to -1.00. A correlation of 0.00 tells us that the two variables are not related at all. The closer a correlation is to 1.00 the stronger is the relationship.
Pearson correlation coefficient
4
When you read about reliability, the correlation will usually be called a ____ ____.
reliability coefficient
5
____-____ reliability is assessed by measuring the same individuals at two points in time.
Test-retest
6
____ ____ reliability is the assessment of reliability using responses at only one point in time.
Internal consistency
7
One indicator of internal consistency is ____-____ reliability; this is a correlation of the total score of one half of the test with the total score of the other half.
split-half
8
Another commonly used indicator of reliability based on internal consistency, called ____ ____, provides us with the average of all possible split-half reliability coefficients. The value of Cronbach's alpha is based on the average of all the inter-item correlation coefficients and the number of items in the measure.
Cronbach's alpha
9
It is also possible to examine the correlation of each item score with the total score based on all items. Such ____-____ correlations are very informative because they provide information about each individual item.
item-total
10
