I was wondering if anyone ever tried calculating Fu's FS statistic in both Arlequin and DnaSP? I did, but I get different values. I used both programs to calculate Tajima's D and Fu's FS, with the same dataset, and I get exactly the same values for Tajima's D but different values for Fu's FS. Does anyone know if the different programs calculate Fu's FS differently? I looked it up on the available documentation but couldn't find much information.