x => d711d75d53edee739c66b0dcfaf8192894ef2bae-update-zipfian-latency.log 
y => r2017.11.06-update-zipfian-latency.log 

         n min     max median  average     stddev p99
x 55520843 0.5 4191.35   1.05 1.584416 21.4822585   3
y 55520843 0.5    2.00   1.05 1.062088  0.3495844   2

               0.8                 1                 1.2               1.4      
 |--------------+------------------+------------------+-----------------+------|
                                       +                                        
1                                      |                                        
                                       +                                        
                                       +                                        
2                                      |                                        
                                       +                                        
Legend: 1=data$x, 2=data$y

At 95% probablitiy:
===> average is statistically significant     (p=0.000000, diff ~0.522329)
===> variance is statistically significant    (p=0.000000)