Hi all, I was attempting to calculate Fst on some 1000 genomes data in binary plink format but I encountered this error below and I'm not quite sure how to get around it. Any suggestions will be greatly appreciated. Thanks Avoks > MySample=read.plink("MyAFR_Plus") > MyAttrib = read.delim("MyAFR", header = TRUE) > MyAttrib = MyAttrib$Pop > FstAFR = Fst(MySample, MAttrib) Error in Fst(MySample, MyAttrib) : STRING_ELT() can only be applied to a 'character vector', not a 'NULL' > sessionInfo() R version 3.0.1 (2013-05-16) Platform: i386-w64-mingw32/i386 (32-bit) locale: [1] LC_COLLATE=English_xxx LC_CTYPE=English_xxx [3] LC_MONETARY=English_xxx LC_NUMERIC=C [5] LC_TIME=English_xxx attached base packages: [1] grid splines stats graphics grDevices utils datasets [8] methods base other attached packages: [1] hexbin_1.26.2 snpStats_1.10.0 Matrix_1.0-12 lattice_0.20-23 [5] survival_2.37-4 loaded via a namespace (and not attached): [1] BiocGenerics_0.6.0 parallel_3.0.1 > [[alternative HTML version deleted]]