General

# 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.

Visit the rest of the site for more useful and informative articles!