We adopt the " haichuanbool form " and " haichuanbo02 form " , which is designed and executed by maritime affair bureau of moc , to collect the data of auxiliary variable . the monthly arrival and departure freight tons of pws units 所需统计汇总的港航监督所站月度辅助变量数据，完全采用交通部海事局制订执行的“海船舶01表”和“海船舶03表” 。
3.
Freight ton ? kilometers ( passenger ? kilometers ) ： refer to the sum of the products of the volume of transported cargo ( passengers ) multiplying by the transport distance , usually using ton ? kilometre and passenger ? kilometre as units for measurement 货物(旅客)周转量：指在一定时期内，由各种运输工具运送的货物(旅客)数量与其相应运输距离的乘积之总和，是反映运输业生产总成果的重要指标，也是编制和检查运输生产计划，计算运输效率、劳动生产率以及核算运输单位成本的主要基础资料。
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