Tajima

Tajima's D is a statistical method used by geneticists to analyze DNA variation within a population. It compares two measures of genetic diversity: one based on the total number of genetic differences between individuals, and another based on the average number of differences in the population. By examining the differences between these measures, Tajima's D can indicate whether a population has experienced recent changes like natural selection, population expansion, or bottlenecks. Positive values suggest a deficiency of rare genetic variants, possibly due to balancing selection or population contraction, while negative values indicate an excess of rare variants, which can result from recent expansion or positive selection.