# File lib/rfuzz/stats.rb, line 79
79:     def sd
80:       # (sqrt( ((s).sumsq - ( (s).sum * (s).sum / (s).n)) / ((s).n-1) ))
81:       begin
82:         return Math.sqrt( (@sumsq - ( @sum * @sum / @n)) / (@n-1) )
83:       rescue Errno::EDOM
84:         return 0.0
85:       end
86:     end