Flashcards in 5.1 Measurement Concepts – Reliability Deck (11):
____ refers to the consistency or stability of a measure of behaviour.
A reliable measure does not ____ from one reading to the next. If the measure does fluctuate, there is error in the measurement device.
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
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
When you read about reliability, the correlation will usually be called a ____ ____.
____-____ reliability is assessed by measuring the same individuals at two points in time.
____ ____ reliability is the assessment of reliability using responses at only one point in time.
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.
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.
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.