These frequency distributions were plotted using these instructions to R:

x=c(7,12,77,15,31,14,2,63,10,16,6,1,18,9,1,9,9,30,11,13,7,28,4,10,11,3,7,8,6,12,4,13,1,3,17,22) y=c(0,10,6,11,22,13,1,8,7,14,6,1,9,3,1,7,7,12,8,14,2,2,2,10,4,0,0,9,6,12,5,10,0,3,14,0) par(mfrow=(c(2,2))) diffs=x-y hist(diffs) hist(log(x+1)-log(y+1), main='histogram of diffs') plot(diffs,rank(diffs),main='rank scatterplot') plot(log(x+1)-log(y+1),rank(log(x+1)-log(y+1)),main='rank scatterplot')