本文对陕西省年、月降水量频数进行了统计检验。检验结果表明:(1)年降水量遵从正态分布;(2)月降水量在做了立方根变换后,有83%的站月遵从正态分布;(3)月降水量中有58%的站遵从γ(Gamma)分布;(4)建议在估算月降水概率时,采用正态分布模型。

In this paper,a statistic examination on the frequencies of annual and monthly precipitations in Shanxi Province has been made. The result sho-ws8(1)the annual precipitation follows the normal distribution,(2)the monthly precipitation, after having its cubic root be transformed, follows normal distribution for 83% of all the stations,(3)among the monthly precipitations, those at 58% of all the stations follow the γ(Gamma) distribution and(4)in estimating the montlily precipitation frequencies, the adoption of normal distribution model is suggested.