Effect size calculation in the chi-squared test for goodness of fit
Compute effect size w for two sets of k probabilities P0 (null hypothesis) and P1 (alternative hypothesis)
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
## Exercise 7.1 p. 249 from Cohen P0<-rep(1/4,4) P1<-c(0.375,rep((1-0.375)/3,3)) ES.w1(P0,P1) pwr.chisq.test(w=ES.w1(P0,P1),N=100,df=(4-1))
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