# File lib/logging/stats.rb, line 106 def sd return 0.0 if num < 2 # (sqrt( ((s).sumsq - ( (s).sum * (s).sum / (s).num)) / ((s).num-1) )) begin return Math.sqrt( (sumsq - ( sum * sum / num)) / (num-1) ) rescue Errno::EDOM return 0.0 end end