# File lib/mongrel/stats.rb, line 75 75: def sd 76: # (sqrt( ((s).sumsq - ( (s).sum * (s).sum / (s).n)) / ((s).n-1) )) 77: begin 78: return Math.sqrt( (@sumsq - ( @sum * @sum / @n)) / (@n-1) ) 79: rescue Errno::EDOM 80: return 0.0 81: end 82: end