Nonoverlap proportion and the representation of point-biserial variation
Fig 2
Nonoverlap proportion and point-biserial correlation.
Theoretical curves and estimated values for point-biserial correlation, rpb, nonoverlap proportion, ρpb, and sample size adjusted correlation, rpbd, for simulated data with unequal sample sizes (NA : NB = 15000 : 500) and the difference between mean values, . Compared to rpbd, rpb is attenuated due to the confounding effect of the binomial sampling factor. A: Uniform unit width
distributions. B: Standard normal (σ = 1) distributions.