Distribution of the correlation coefficient (ρ) across wereda. Histogram showing the values of the intra-cluster correlation coefficient calculated for 43 weredas for which information about the kebelle of origin of the samples was available as indicated in the Methods section. Two groups can be distinguished: one including almost 80% of the weredas with low values of ρ (ρ < 0.12) and the other with 9.3% of the weredas showing a strong intracluster correlation (ρ > 0.37).
Waret-Szkuta et al. BMC Veterinary Research 2008 4:34 doi:10.1186/1746-6148-4-34