研究途径主要有两条：1）根据古代天象记录，通过现代天文计算推定其年代；
There are chiefly two research ways as: (1) Calculating the astronomical phenomena in the records of ancient literature by new method in astronomy, the collect years could be elected.
通过电子计算机模拟试验分析了推定误差并讨论其应用问题。
The estimate errors are analyzed by computer simulation and its application is discussed.
该方法是将极大熵原理应用于电梯交通，建立极大熵模型，并根据整数推定算法产生乘客O-D矩阵，最后给出了计算实例。
The method applies the maximum entropy to elevator traffic and constructs a maximum entropy model, then uses an integer estimation algorithm to produce the passenger O-D matrix.
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