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als-statistics

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Modular JS statistics toolkit for Node.js and the browser: descriptive stats, correlations (Pearson/Spearman/Kendall), t-tests & ANOVA (Student/Welch), reliability (Cronbach’s alpha), regression (linear/logistic), clustering (DBSCAN/HDBSCAN), and table/co

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<title>Cronbach’s Alpha</title> <description>## Class: `CronbachAlpha`</description> <keywords>cronbach, s, alpha, class, cronbachalpha, public, fields, js, new, data, record, string</keywords> # Cronbach’s Alpha ## Class: `CronbachAlpha` **Constructor** ```js new CronbachAlpha(data: Record<string, number[]>) ``` - Requires **≥ 2** parallel scales/items of equal length. ### Public fields - `alpha: number` – reliability estimate. - `sumOfVariances: number` – sum of item variances (sample). - `sumColumnVariance: number` – variance of summed score across rows. - `bessel: number` – correction factor `k/(k-1)`. - `ifItemsDeleted: Record<string, number>` – getter recomputed lazily. - `htmlTable: string` – formatted summary table (getter).