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Modern Psychology and Educational Statistics Chapter 5: Solving problems after class! ! ! !
There are three kinds of quartile correlation φ correlation contingency table correlation in quality correlation.

Quartile correlation is used for correlation where two variables are continuous and each variable is artificially divided into two types of data. For example, there are two kinds of people, those who pass and those who fail.

φ correlation is used for real binary variables. Like men and women.

Correlation table correlation is used to study the correlation between two factors in R×C table.

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