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在兰州、天水、西宁站的货场抽取发送货物、到达货物各300批进行调查,得到发送货物、到达货物占用货位时间t参数的观测值。对观测值进行统计分析,可知其频率峰值位于1.5~2.0 d附近,并随偏离量的递增而呈现对称单调递减的趋势,由此可假定t参数值近似服从正态分布。分别运用2χ检验法、SHAPIROWILK检验法对发送货物、到达货物t参数值的分布进行检验,并对2种检验结果进行对比分析。结果表明:发送货物、到达货物t参数值的分布各自服从正态分布,且分别在1.742和1.749 d左右波动。由此可知,发送货物t参数的观测值与现行规章的取值比较吻合;而到达货物参数t观测值与现行规章的取值相差较大。
In Lanzhou, Tianshui, Xining station yard to send and receive the goods to reach the 300 batches of goods were investigated, to be sent to the goods, arrived at the cargo occupied time t parameter observations. Statistical analysis of the observed values shows that the frequency peak is located around 1.5 to 2.0 d, and shows a symmetrical monotonically decreasing trend as the deviation increases. Therefore, it can be assumed that the t parameter approximately follows the normal distribution. The 2χ test and SHAPIROWILK test were used to test the distribution of the t-value of the goods delivered and the arrival of the goods, respectively. The two test results were compared and analyzed. The results show that the distribution of the t-values of the delivered goods and the arrival goods follows the normal distribution and fluctuates around 1.742 and 1.749 d, respectively. From this it can be seen that the observed value of the t parameter of the sent goods agrees well with the value of the current regulations, while the value of the observed goods arrival parameter t differs greatly from the value of the current regulations.