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| クロンバックのα（信頼性分析）× | 主成分分析× | |
|---|---|---|
| 分野≠ | 統計学 | 機械学習 |
| 系統≠ | Latent structure | Machine learning |
| 提唱年≠ | 1951 | 2002 |
| 提唱者≠ | Lee J. Cronbach | Jolliffe, I.T. (textbook); Pearson & Hotelling (origins) |
| 種類≠ | Reliability / internal consistency coefficient | Unsupervised dimensionality reduction |
| 原典≠ | Cronbach, L. J. (1951). Coefficient alpha and the internal structure of tests. Psychometrika, 16(3), 297–334. DOI ↗ | Jolliffe, I.T. (2002). Principal Component Analysis (2nd ed.). Springer. DOI ↗ |
| 別名 | coefficient alpha, alpha reliability, internal consistency reliability, Güvenilirlik Analizi (Cronbach Alpha) | Temel Bileşenler Analizi (PCA), PCA, principal components analysis, Karhunen-Loève transform |
| 関連≠ | 4 | 3 |
| 概要≠ | Cronbach's alpha is a coefficient of internal consistency that quantifies the degree to which a set of items on a scale measures the same underlying construct. Introduced by Lee J. Cronbach in 1951, it remains the most widely reported reliability index in social-science, health, and educational research. | Principal Component Analysis (PCA) is an unsupervised dimensionality-reduction method — given its modern textbook treatment by Ian Jolliffe (2002) — that compresses high-dimensional data into fewer dimensions while preserving the maximum possible variance. It re-expresses correlated variables as a small set of uncorrelated principal components ordered by how much of the data's variation each one captures. |
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