9/15/2023 0 Comments Psychometric reliability![]() In this example, the overall reliability statistic is. The analysis provides a summary of how the items within the scale perform together in measuring a person’s propensity for recreational shopping. There are exceptions to this rule in the case of brief measurements when breadth of content is of primary interest in recapturing a longer scale (see example here).īelow is an example of a reliability analysis for a Recreational Shopping scale. ![]() A general rule of thumb is that solid scientific instruments should have a Cronbach’s Alpha of at least. One of the most common assessments of reliability is Cronbach’s Alpha, a statistical index of internal consistency that also provides an estimate of the ratio of true score to error in Classical Test Theory. Reliability is the degree to which an instrument consistently measures a construct - both across items (e.g., internal consistency, split-half reliability) and time points (e.g., test-retest reliability). These psychometrics are crucial for the interpretability and the generalizability of the constructs being measured. ![]() In order for any scientific instrument to provide measurements that can be trusted, it must be both reliable and valid. Share this blog post on Twitter Share this blog post on Facebook Share this blog post on LinkedIn Psychometrics 101: Scale Reliability and Validity ![]()
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