> library(effsize)
> a <- c(1,1,1,1,1,1,1,1,1,1,1,1,1,1)
> b <- c(1.1,1.1,1.1,1.1,1.1,1.1,1.1,1.1,1.1,1.1,1.1,1.1,1.1,1.1)
> wilcox.test(a)

	Wilcoxon signed rank test with continuity correction

data:  a
V = 105, p-value = 0.0002105
alternative hypothesis: true location is not equal to 0

Warning message:
In wilcox.test.default(a) :
  não é possível computar o valor de p exato com o de desempate
> cliff.delta(a,b)

Cliff's Delta

delta estimate: -1 (large)
95 percent confidence interval:
inf sup
NaN NaN