public class DanielTrendTestextends StatisticalTestThe Daniel Trend test. This test computes Spearman's correlation coefficient to measure association between bivariate samples. Two samples, with 3 o more values are needed. A exact p-value is computed if the size of the sample is equal or lower than 10. If the size is between 11 and 30, a quantile approximation is computed. Ties are broken arbitrarily. Furthermore, an asymptotic p-value, measuring positive, negative, and no dependence is computed for any sample size.