What is an item in statistics?

What is an item in statistics?

Item or test item are called the individual tasks or questions of a psychological test. The items are assigned to a certain characteristic to be measured (cf. operationalization) and provide a value (point value) which, in the simplest case, is offset across all items to form a raw value for the characteristic.

What is the total score?

The point values ​​of the individual item answers on the Likert scale are added up and thus result in a total score for the overall scale. This value is clearly to be regarded as metric (interval scaled).

What is a scale?

A scale represents a rule that assigns an observation value (a date) for the characteristic of interest to each observation in a statistical unit of a sample. The definition of a scale for a characteristic is called scaling (measurement).

What does Cronbach’s Alpha say?

Cronbach’s Alpha is used to measure the degree of agreement (internal consistency) between multiple questions in a questionnaire.

What values ​​can Cronbach’s alpha take?

Like the correlation coefficient, Cronbach’s alpha can have values ​​between -1 and 1. The advantage of Cronbach’s Alpha is that it gives us a single, easy-to-interpret measure of the strength of reliability.

What is the internal consistency?

Internal consistency is a measure of how the items on a scale are related to one another. Internal consistency is, so to speak, a detour to ascertain the measurement accuracy of an instrument if no retest or parallel test is available to determine reliability.


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