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| V di Cramer× | Test esatto di Fisher× | |
|---|---|---|
| Campo | Statistica | Statistica |
| Famiglia | Hypothesis test | Hypothesis test |
| Anno di origine≠ | 1946 | 1922 |
| Ideatore≠ | Harald Cramér | R. A. Fisher |
| Tipo≠ | Nonparametric association measure | Exact test of independence for categorical data |
| Fonte seminale≠ | Cramér, H. (1946). Mathematical Methods of Statistics. Princeton University Press. ISBN: 978-0691080420 | Fisher, R. A. (1922). On the interpretation of chi-squared from contingency tables, and the calculation of P. Journal of the Royal Statistical Society, 85(1), 87–94. DOI ↗ |
| Alias≠ | cramers v, cramer v, phi coefficient (r×c), Cramer's V (İlişki Kuvveti) | Fisher-Irwin test, exact test of independence, Fisher'ın Kesin Testi |
| Correlati≠ | 3 | 2 |
| Sintesi≠ | Cramer's V is a nonparametric effect-size statistic that measures the strength of association between two categorical variables on a scale from 0 to 1. Introduced by the Swedish mathematician Harald Cramér in his 1946 work Mathematical Methods of Statistics, it generalises the phi coefficient to tables of any size, making it the standard companion statistic to the chi-square test. | Fisher's exact test is a nonparametric exact-probability test of independence for small-sample contingency tables, introduced by R. A. Fisher in 1922. Rather than relying on a large-sample approximation, it computes the exact probability of the observed table directly from the hypergeometric distribution. |
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