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Cronbach's alpha (Cronbach's ), also known as tau-equivalent reliability or coefficient alpha (coefficient ), is a reliability coefficient and a measure of the internal consistency of tests and measures. [1] [2] [3] It was named after the American psychologist Lee Cronbach.
Internal consistency is usually measured with Cronbach's alpha, a statistic calculated from the pairwise correlations between items. Internal consistency ranges between negative infinity and one. Coefficient alpha will be negative whenever there is greater within-subject variability than between-subject variability.
It is a special case of Cronbach's α, computed for dichotomous scores. [2] [3] It is often claimed that a high KR-20 coefficient (e.g., > 0.90) indicates a homogeneous test. However, like Cronbach's α, homogeneity (that is, unidimensionality) is actually an assumption, not a conclusion, of reliability coefficients.
In logic, a set of symbols is commonly used to express logical representation. The following table lists many common symbols, together with their name, how they should be read out loud, and the related field of mathematics.
SAALBACH-HINTERGLEMM, Austria (AP) — Lindsey Vonn completed pre-race inspection and was planning on competing in the super-G at the Alpine skiing world championships on Thursday despite feeling ...
An AI-powered death clock is getting an influx of use after claiming to predict the method and age at which you will die. Death Clock says it utilizes AI to analyze age, weight, sex, smoking and ...
Earlier this month, broccoli was recalled from Walmart due to possible listeria contamination. On January 27, the U.S. Food and Drug Administration (FDA) updated the recall classification to Class ...
From January 2008 to December 2012, if you bought shares in companies when Charles D. Powell joined the board, and sold them when he left, you would have a 23.5 percent return on your investment, compared to a -2.8 percent return from the S&P 500.