What are the reliability considerations for power tests? How does item difficulty affect Cronbach's alpha?

Cronbach's alpha is the most common measure of internal consistency ("reliability"). It is most commonly used when you have multiple Likert questions in a ... Oct 14, 2015 ... We formulate a statistical model for parallel items to derive power functions as a function of C α under several study designs. Dec 4, 2010 ... This application performs a basic Cronbach's alpha analysis on data provided by the user. The data may be supplied as numerical scores or ... Jun 18, 2020 ... Researchers typically use Cronbach's Alpha when they want to know how much variance is item-specific and not shared by other items in the set. Alpha is a very nice command used to calculate Cronbach's alpha for scales. The basic syntax is simply alpha [variables in the scale] and requires at least two ... Abstract. Cronbach's alpha is a statistic commonly quoted by authors to demonstrate that tests and scales that have been constructed or adopted for research ... Cronbach's alpha range per subscale: 1. Requirements 0.88–0.94, 2 ... α = Cronbach's alpha. Back to article page. Implementation Science. ISSN: 1748 ... Internal reliability was reported using both Cronbach's alpha and ordinal alpha. The DASS-21 and EPDS ability to discriminate cases from non-cases was ... What does Cronbach's alpha mean? | SPSS FAQ. Cronbach's alpha is a measure of internal consistency, that is, how closely related a set of items are as a group. Jan 17, 2025 ... We examine whether α values reported in the psychological literature show signs of inflation, for example, because of publication bias or hacking.