Methods: Explanation of the research involved; so others can duplicate the research or study.
Sample methods section: Five regions were chosen from the global sample of human populations for which gene frequency data are given in Cavalli-Sforza et al. (1994): Europe (containing 26 populations), West Asia (18 populations), East and Central Asia (21), Southeast Asia (24), and West Africa (13). The populations whose data were used are listed by regional group in the Appendix, along with the language attributed to them and its linguistic classification. The choice of regions was based on the presence of several different well-characterized language families, and the clear identifiability of the geographic location and language spoken by each population.