Compute effect size w for two sets of k probabilities P0 (null hypothesis) and P1 (alternative hypothesis)

1 | ```
ES.w1(P0, P1)
``` |

`P0` |
First set of k probabilities (null hypothesis) |

`P1` |
Second set of k probabilities (alternative hypothesis) |

The corresponding effect size w

Stephane CHAMPELY

Cohen, J. (1988). Statistical power analysis for the behavioral sciences (2nd ed.). Hillsdale,NJ: Lawrence Erlbaum.

pwr.chisq.test

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