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| Pitkittäinen Cronbachin alfa× | Testi-uusintatestausreliabiliteetti× | |
|---|---|---|
| Tieteenala | Psykometriikka | Psykometriikka |
| Menetelmäperhe | Latent structure | Latent structure |
| Syntyvuosi≠ | 1951 (alpha); longitudinal application systematised ca. 1990s–2000s | 1904 |
| Kehittäjä≠ | Lee J. Cronbach (alpha); longitudinal extension formalised in scale validation literature from 1980s onward | Karl Pearson |
| Tyyppi≠ | Reliability estimation across time | Reliability estimate |
| Alkuperäislähde≠ | Cronbach, L. J. (1951). Coefficient alpha and the internal structure of tests. Psychometrika, 16(3), 297–334. DOI ↗ | Nunnally, J. C. & Bernstein, I. H. (1994). Psychometric Theory (3rd ed.). McGraw-Hill. ISBN: 978-0070478497 |
| Rinnakkaisnimet | repeated-measures alpha, longitudinal internal consistency, wave-specific Cronbach's alpha, time-point reliability estimation | stability reliability, temporal stability, repeatability coefficient, TRT reliability |
| Liittyvät | 4 | 4 |
| Tiivistelmä≠ | Longitudinal Cronbach's alpha assesses the internal consistency reliability of a scale at each wave of a repeated-measures study and examines whether that reliability remains stable across time. It is an essential step in longitudinal scale validation, ensuring that a scale measures its construct with consistent precision at every measurement occasion. | Test-retest reliability quantifies the temporal consistency of a measure by correlating scores obtained from the same participants on two separate occasions. It is a cornerstone of psychometric validation, directly indicating whether a scale or instrument yields stable scores when the underlying construct has not changed. |
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