The method of least squares is used for the trend calculation of the temperature, and the Theil-Sen equation for the precipitation. The levels of significance were estimated with the non-parametric test according to Mann-Kendall.
References:
- Kendall M.G., 1975: Rank Correlation Methods, Charles Griffin, London.
- Mann H.B., 1945: Nonparametric tests against trend. Econometrika 13:245-259.
- Sen P.K., 1968: Estimates of the regression coefficient based on Kendall's tau. Journal of the American Statistical Association, 63, 1379-1389.
- Theil H., 1950: A rank-invariant method of linear and polynomial regression analysis. Netherlands Akad. Wetensch. Proc., 53, pages: 386-392 (part I), 521-525 (part II), 1397-1412 (part III).