Effet théorique et chi-carré; comment calculer le phi-deux et le V de Cramer?
Understand the Problem
La question est basée sur des concepts statistiques, notamment sur les effets théoriques et le test du chi-carré, ainsi que sur le calcul de certains indicateurs statistiques tels que le phi-deux et le V de Cramer. Il semble que le document fournit des formules et des exemples pour démontrer comment ces concepts sont utilisés.
Answer
Phi-deux: φ² = χ²_observed / n; V de Cramer: V = sqrt(φ² / min(J-1, K-1)).
The phi-deux is calculated as φ² = χ²_observed / n, and the V de Cramer is V = sqrt(φ² / min(J-1, K-1)).
Answer for screen readers
The phi-deux is calculated as φ² = χ²_observed / n, and the V de Cramer is V = sqrt(φ² / min(J-1, K-1)).
More Information
The phi-deux and V de Cramer are measures of effect size that indicate the strength of association between categorical variables. They are standardized measures derived from the chi-square statistic.
Tips
A common mistake is confusing the calculation of the theoretical and observed chi-square. Ensure that you have calculated the expected frequencies correctly before computing the chi-square statistic.
