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科学软件网专注提供科研软件。截止目前，共代理千余款，软件涵盖各个学科。除了软件，科学软件网还提供课程，包含34款软件，66门课程。热门软件有：spss，stata，gams，sas，minitab，matlab，mathematica，lingo，hydrus，gms，pscad，mplus，tableau，eviews，nvivo，gtap，sequncher，simca等等。GTAP Data Base不支持的功能GTAP Data Base不是输入-输出表的存储库。GTAP Data Base是世界经济在当前版本年数据库的一致表现。数据库包含了多个数据来源的国家投入产出表、贸易、宏观经济和保护数据。潜在的输入-输出表在数据源、年份库和部门具体细节上是多种多样的，因此，为了实现一致性，我们作出了大量努力，使不同的来源具有可比性。由于这些原因，GTAP Data Base的目标不是提供IO表，而是为经济模拟模型的运行提供便利，以确保用户能够得到一致的经济事实。一些对特定SAM感兴趣的用户使用网络中的研究人员编写的实用工具来提取它们。基于这些信息用户根据自身的风险构建IO表，并假定理解数据库构建过程所带来的局限性。GTAP Data Base不是经济数据的时间序列存储库。除了贸易数据之外，GTAP Data Base是关于消费、生产和贸易的一致数据的截面。一些用户认为将不同版本的数据绑定在一起会给他们带来时间序列的变化。我们强烈建议用户熟悉GTAP Data Base的构建过程，考虑到对于许多国家来说，基础的IO表不会从版本到版本的变化，大部分的变化来自于基于宏观经济或贸易变化的调整过程。GTAP Data Base不是经济变量的关系数据库。只有对经济数据感兴趣的用户才能更好地服务于诸如世界银行发展指标、国际货币基金组织的金融统计数据或粮农组织的农业统计数据等。GTAP Data Base上的数据准确地描述经济变量的大小，但它们是以服务于CGE建模集合表示的。系统要求硬盘至少有256 Mb的内存，操作系统Windows 98, 2000, XP, Vista, 7 or 8或以上。What is the GTAP 9 Data Base?The centerpiece of the Global Trade Analysis Project is the GTAP Data Base, a fully documented, publicly available global data base which contains complete bilateral trade information, transport and protection linkages. The GTAP Data Base represents the world economy and is utilized by thousands worldwide as a key input into contemporary applied general equilibrium (AGE) analysis of global economic issues. The current release, the GTAP 9 Data Base, features 2004, 2007 and 2011 reference years as well as 140 regions for all 57 GTAP commodities. The GTAP Data Base is most commonly used with the GTAP Model and RunGTAP software. First, the user must aggregate the data (regions, commodities and endowments) using the GTAPAgg (or FlexAgg) program provided with the data base to the desired level and then use with the GTAP or GTAPinGams model/s to analyze the impact of global policies (trade, environmental, migration policies are commonly examined). Alternatively a user may be interested in extracting country SAMs or I-O tables from the GTAP Data Base for single country models. If you are interested in these alternative uses of the GTAP Data Base, we suggest you read through the points detailed on this page about what GTAP Data Base is not.The GTAP Data Base is a consistent representation of the world economy for a pre-determined reference year. Underlying the data base there are several data sources, including among others: national input-output (I-O) tables, trade, macroeconomic, energy and protection data. The underlying input-output tables are heterogeneous in sources, methodology, base years, and sectoral detail, thus for achieving consistency, substantial efforts are made to make the disparate sources comparable. For these reasons, the objective of the GTAP Data Base is not to provide I-O tables, but to facilitate the operation of economic simulation models ensuring users a consistent set of economic facts. Some users interested in particular Social Accounting Matrices (SAMs) use utilities written by researchers in the network to extract them. Users building I-O tables based on this information do that under their own risk, and are assumed to understand the limitations imposed by the process of data base construction.GTAP Data Base全球贸易分析数据库GTAP Data Base是什么？GTAP Data Base是全球贸易分析项目的核心，它是一个完整的、公开的全球数据库，包含完整的双边贸易信息、运输和保护联系。GTAP Data Base代表世界经济并被世界各地数以千计的人作为当代应用一般均衡对全球经济问题分析的关键来使用。近的一个版本主要是以2004年、2007年和2011年为参考年份，以及140个地区的所有57个项目的商品。GTAP Data Base常用的是和GTAP模型和RunGTAP软件一起使用。首先，用户必须使用Data Base提供的GTAPAgg(或FlexAgg)程序，汇集数据(区域、商品和捐赠)到所需的水平，然后使用GTAP或GTAPinGams模型来分析全球政策的影响（贸易、环境、移民政策通常被检查）。或者，用户可能想从GTAP Data Base中提取国家SAMs或I-O表，用于单个国家模型。如果您感兴趣的是GTAP Data Base的其他用途，我们建议您阅读GTAP Data Base is not页面的详细信息。 GTAP Data Base不是经济变量的关系数据库。只有对经济数据感兴趣的用户才能更好地服务于诸如世界银行发展指标、国际货币基金组织的金融统计数据或粮农组织的农业统计数据等。GTAP Data Base上的数据准确地描述经济变量的大小，但它们是以服务于CGE建模集合表示的。系统要求硬盘至少有256 Mb的内存，操作系统Windows 98, 2000, XP, Vista, 7 or 8或以上。The GTAP Data Base is NOTa repository of Input-Output tables. The GTAP Data Base is a consistent representation of the world economy in the year base of the current version. Underlying the data base there are national input-output tables, trade, macroeconomic, and protection data from several sources. The underlying input-output tables are heterogeneous in sources, base years, and sectoral detail, thus for achieving consistency, substantial efforts are made to make the disparate sources comparable. For these reasons, the objective of the GTAP Data Base is not to provide IO tables, but to facilitate the operation of economic simulation models ensuring users a consistent set of economic facts. Some users interested in particular SAM use utilities written by researchers in the network to extract them. Users building IO tables based on this information do that under their own risk, and are assumed to understand the limitations imposed by the process of data base construction.GTAP Data Base是什么？GTAP Data Base是全球贸易分析项目的核心，它是一个完整的、公开的全球数据库，包含完整的双边贸易信息、运输和保护联系。GTAP Data Base代表世界经济并被世界各地数以千计的人作为当代应用一般均衡对全球经济问题分析的关键来使用。近的一个版本主要是以2004年、2007年和2011年为参考年份，以及140个地区的所有57个项目的商品。GTAP Data Base常用的是和GTAP模型和RunGTAP软件一起使用。首先，用户必须使用Data Base提供的GTAPAgg(或FlexAgg)程序，汇集数据(区域、商品和捐赠)到所需的水平，然后使用GTAP或GTAPinGams模型来分析全球政策的影响（贸易、环境、移民政策通常被检查）。或者，用户可能想从GTAP Data Base中提取国家SAMs或I-O表，用于单个国家模型。如果您感兴趣的是GTAP Data Base的其他用途，我们建议您阅读GTAP Data Base is not页面的详细信息。科学软件网为全国大多数高校提供过产品或服务，专业销售和售后团队，确保您售后无忧！
