r - Standard deviation for a subset -

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i trying calculate mean , standard deviation variable within subset. coding works fine mean not sd. have included sample data= orf1 came subset. help?

 mean(stocking.density2012,na.rm=true,data=orf1)     [1] 13.72386     > sd(stocking.density2012,na.rm=true,data=orf1)     error in sd(stocking.density2012, na.rm = true, data = orf1) :        unused argument (data = orf1)   region stocking.density2012         1            12      8            7       2            12      8            17      1            34      3            24      1            16      2            5       1            5       4            11      1            5       3            3       7            3       5            13      1            18      4            15      2            18      1            10      6            5       1            10      5            46      1            19      3            12      1            15      6            4       1            4       7            8       1            8       8            12

data neither argument mean nor sd, stocking.density2012 must in enclosing environment. perhaps attached it.

mean doesn't give error because has ... argument, sd not.


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