What does “test-retest reliability” mean? Give an example.
What will be an ideal response?
Test-Retest Reliability
When researchers measure a phenomenon that does not change between two points separated by an interval of time, the degree to which the two measurements yield comparable, if not identical, values is the test-retest reliability of the measure. If you take a test of your math ability and then retake the test two months later, the test is performing reliably if you receive a similar score both times, presuming that nothing happened during the two months to change your math ability. Of course, if events between the test and the retest have changed the variable being measured, then the difference between the test and retest scores should reflect that change.
Inter-Item Reliability (Internal Consistency)
When researchers use multiple items to measure a single concept, they are concerned with inter-item reliability (or internal consistency). For example, if we are to have confidence that a set of questions reliably measures an attitude, say, attitudes toward violence, then the answers to the questions should be highly associated with one another. The stronger the association between the individual items and the more items included, the higher the reliability of the index. Cronbach’s alpha is a reliability measure commonly used to measure inter-item reliability. Of course, inter-item reliability cannot be computed if only one question is used to measure a concept. For this reason, it is much better to use a multi-item index to measure an important concept (Viswanathan, 2005).
Test-retest reliability is a measurement showing that measures of a phenomenon at two points in time are highly correlated, if the phenomenon has not changed, or have changed only as much as the phenomenon itself.
Interitem reliability is an approach that calculates reliability based on the correlation among multiple items used to measure a single concept.
Cronbach’s alpha is a statistic that measures the reliability of items in an index or scale.
You might also like to view...
Where a motorist has been forced to allow the extraction of blood that has been analyzed for alcoholic content, the use of blood alcohol testing resulting in a prosecution for driving while intoxicated violates the defendant's Fifth Amendment
privilege against self-incrimination because the driver has been effectively forced to testify against him or herself. Indicate whether the statement is true or false
Answer the following statement(s) true (T) or false (F)
1. The t test is considered an appropriate test for use with continuous dependent variables. 2. The t test is a test most appropriately used to test hypotheses involving a single population. 3. A sampling distribution of differences between means is created by pulling infinite pairs of samples, finding the difference between their means, and plotting those differences on a graph. 4. A t test is intended for use with an independent variable of categorical level of measurement.
The past Supreme Court requirement that a physical intrusion by authorities must have taken place to violate one's privacy is referred to as the:
a. electronic communication protection doctrine.
b. privacy doctrine.
c. trespass doctrine.
d. physical protection doctrine.
Which of the following systems of confinement avoided the harmful psychological effects of total solitary confinement and allowed more inmates to be housed in less space because cells could be smaller?
A. the Pennsylvania system B. the Auburn system C. the snitch system D. the separate system