PMC

Estimated distribution B_(iii) of the frequency of Wolbachia within species. The underlying data set includes only the samples in which fewer than 100 individuals were tested.

Numbers of species with infection densities in the particular intervals. Gray bars describe the observations made in samples with sample size n_j≥22. The black bars indicate the number of species expected based on B_(iii). The value of the χ²- statistic is 8.4 (<14, error probability 5%), thus we can accept this distribution as an underlying density function. Here, also B_(i) could be accepted, whereas B_(ii) had to be rejected.