When distribution statistics are generated for the column "TYPE," the optimizer knows the real frequencyof each model.
而一旦生成了关于“TYPE”列的分布统计信息，优化器即可了解每种型号真正的出现频率。
2
A nonparametric kernel estimation of the flood frequency with historic information is presented in this paper. The limitation in assuming a distributiontype is overcome.
本文提出了在有历史洪水情况下洪水频率的非参数核估计方法，克服了现行方法假定分布型式的局限。
3
The typeof syndrome, the recipe total count, medicine total count, medicine utilization frequency and medicine categorization were analyzed with frequence distribution method.