Hypothesis test
Chi-square Test of Independence
The chi-square test of independence is a nonparametric hypothesis test that examines whether two categorical variables are associated by comparing observed and expected frequencies in a cross-tabulation. It rests on the chi-square criterion introduced by Karl Pearson in 1900.
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Sources
- Pearson, K. (1900). On the criterion that a given system of deviations from the probable in the case of a correlated system of variables is such that it can be reasonably supposed to have arisen from random sampling. Philosophical Magazine, 50(302), 157–175. DOI: 10.1080/14786440009463897 ↗
- Agresti, A. (2007). An Introduction to Categorical Data Analysis (2nd ed.). Wiley. ISBN: 978-0471226185