The symbol for an effect size index is ? (rho).

Name: The symbol for an effect size index is ? (rho).
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The symbol for an effect size index varies depending on the specific index being referred to (e.g., Cohen's d, r for correlation coefficient), but "?" (rho) is not commonly used to denote an effect size index. Rho is typically used to represent the population correlation coefficient in statistics.

The Symbol for an Effect Size Index Is ? (Rho)