Because the data do not fit theoretical null distributions, attempts to infer natural selection from polymorphism data will require genome - wide surveys of polymorphism in order to identify anomalous regions. (journals.plos.org)
The null distribution looks an awful lot like our actual results: it is almost flat in the middle and flares at the ends (see Figure 2). (educationnext.org)
The estimates hewed very close to the null distribution, suggesting that little but estimation error was present. (educationnext.org)