The moving average method, MannKendall
testing method [21], and self-correlation diagram
were used to analyze the trend and the dependency of the
annual runoff, and homogeneous degree and variation and
self-correlation diagram were used to analyzen the distribution
of the monthly runoff.
2.2. Nearest Neighbor Bootstrapping Regressive Model. Nearest
neighbor bootstrapping regressive model (NNBR) is data
driven and nonparametric, with potential priority, and needs
no assumption in the form of dependence and probability
distribution, as well as no estimate of many parameters [22–
24].