# File lib/mongrel/stats.rb, line 64 64: def sd 65: # (sqrt( ((s).sumsq - ( (s).sum * (s).sum / (s).n)) / ((s).n-1) )) 66: begin 67: return Math.sqrt( (@sumsq - ( @sum * @sum / @n)) / (@n-1) ) 68: rescue Errno::EDOM 69: return 0.0 70: end 71: end