Hi everyone, before I embark in some coding, can I ask if there is any function in any of the packages on CRAN dealing with the natural selection coefficient S? At the moment I am more curious to see it has been implemented already in R, rather than what specific implementation. Regards, Federico Calboli -- Federico C. F. Calboli Department of Epidemiology and Public Health Imperial College, St Mary's Campus Norfolk Place, London W2 1PG Tel +44 (0)20 7594 1602 Fax (+44) 020 7594 3193 f.calboli [.a.t] imperial.ac.uk f.calboli [.a.t] gmail.com