UC知道翻译一篇经济学相关文章（四）
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data are from the FPCRS, while observations on variables in the inefficiency functions
are provincial averages from SSB thus are not farm unit observations. Consequently, the
two data sets may not be in exact correspondence, which could lead to some biases in the
estimationresults. TheFPCRSpaneldataarenotbalancedassomesampleprovincesdidnot
conductthesurveyinallyears. Fortunately,thepaneldatamodelspecifiedinthepreceding
sectionpermitstheuseofunbalanceddata(Coelli,1994). Inpassing,wenotethatwhilethe
FPCRSdatasetisnotflawless,itistheonlydatasetthatpossessesanation-widecoverage
and provides exact correspondence between inputs andoutputs of individual crops.
To allow for regional and varietal differences in grain production, dummy variables as
defined in Table 1 are added to the relevant production frontiers. Dummy variables MR
andLRareincludedintheind
数据被用于在本文盖子期间从1983 年1996 年。所有输入- 输出数据是从FPCRS ，当观察在可变物在无效用作用是省平均从SSB 因而不是农厂单位观察。结果，二个数据集不能是在确切的书信，能导致一些偏心在estimationresults 。TheFPCRSpaneldataarenotbalancedassomesampleprovincesdidnot conductthesurveyinallyears 。幸运地，thepaneldatamodelspecifiedinthepreceding 的sectionpermitstheuseofunbalanceddata(Coelli ，1994) 。Inpassing ，wenotethatwhilethe FPCRSdatasetisnotflawless ，itistheonlydatasetthatpossessesanation-widecoverage 和提供确切的书信在各自的庄稼之间输入andoutputs 。考虑到在五谷生产上的地方和种类区别，假设变量象被定义在表1 增加到相关的生产边境。假设变量andLRareincludedintheindicariceequationinordertopoolobservationsonearly 米先生，中间米和后米生产。地区由唯一庄稼控制由假设变量NR.For 麦子，NR 代表分离春小麦从winterwheat 。164 TIAN 和WAN 5 。结论这塑造的锻炼的结果表明劳方边际生产力在cerealproductionisquitelowandshouldnotbereliedonasanimportantsourceforfuture 出产量成长。当肥料输入的进一步增加可能被辩解为麦子，范围为产品成长也许是有限的。并且，化肥的冲击对环境应该仔细地被考虑(黄和Rozelle 1995) 。一主要发现的ofthisstudyisthatChinacannolongerrepeatitspastgrainproductiongrowth ，whichhas beendriven 主要由增加的化肥用法。
论文中所用到的数据垮度从1983年到1996年。所有输入输出数据都摘自FPCRS，并且有效性函数中变量的观察值是来自SSB的全省平均值