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关 键 词:StataPro
行 业:IT 软件 教学管理软件
发布时间:2023-12-30
截止目前,科学软件网已获得数百家国际软件公司正式授权,代理销售科研软件达一千余种,软件涵盖领域包括经管,仿真,地球地理,生物化学,工程科学,排版及网络管理等。同时,还提供培训、课程(包含34款软件,66门课程)、实验室解决方案和项目咨询等服务。科学软件网专注提供科研软件。
Stata是一款完整的、集成的统计软件包,提供您需要的一切数据分析、数据管理和图形。 快速,简单并易于使用 点击式的界面和强大,直观的命令语言让Stata使用起来快速,并易于使用。 所有的分析结果都可以被复制和存档,并用来出版和审查。不管您什么时候写的内容,版本控制系统确保统计程序可继续生成同样的结果。 完整的数据管理功能 Stata的数据管理功能让您控制所有类型的数据。 您可以重组数据,管理变量,并收集各组并重复统计。您可以处理字节,整数,long, float,double和字符串变量(包括BLOB和达到20亿个字符的字符串)。Stata还有一些的工具用来管理的数据,如生存/时间数据、时间序列数据、面板/纵向数据、分类数据、多重替代数据和调查数据。 Stata轻松生成出版质量、风格迥异的图形。您可以编写脚本并以可复制的方式生成成百上千个图形,并且可以以EPS或TIF格式输出打印、以PNG格式或SVG格式输出放到网上、或PDF格式输出预览。使用这个图形编辑器可更改图形的方面,或添加标题、注释、横线、箭头和文本。 扩展功能 Stata的编程功能让开发者和用户每天都可以添加新功能以便满足现代研究者日益增加的功能需求。 使用Mata进行矩阵编程 Mata是一个成熟的编程语言,可编译您所输入的字节,并进行优化和准确执行。 尽管您不需要使用Stata进行编程,但是它作为一个快速完成矩阵的编程语言,是Stata功能中重要的一部分。Mata既是一个操作矩阵的互动环境,也是一个完整开发环境,可以生产编译和优化代码。它还包含了一些功能来处理面板数据、执行真实或复制的矩阵运算,提供完整的支持面向对象的编程,并完全兼容Stata。 科学软件网是一个以引进国研软件,提供软件服务的营业,由天演融智软件有限公司创办,旨在为国内高校、科研院所和以研发为主的企业事业单位提供的科研软件及相关软件服务。截止目前,科学软件网已获得数百家国际软件公司正式授权,代理销售科研软件达一千余种,软件涵盖领域包括经管,仿真,地球地理,生物化学,工程科学,排版及网络管理等。同时,还提供培训、视频课程(包含40款软件,80门课程)、实验室解决方案和项目咨询等服务。 不管您是需要购买单款软件,还是制定整个实验室的购买方案,都可以提供。
The new meta suite is broad, but what sets it apart is its simplicity. You can type, for instance, . meta set effectsize stderr to declare precomputed effect sizes or use meta esize to compute effects from summary data. With this, you can perform random-effects, fixed-effects, or common-effect meta-analysis. To estimate an overall effect size and its confidence interval, obtain heterogeneity statistics, and more, you simply type . meta summarize And visualizing the results is as easy as typing . meta forestplot But the meta suite provides much more. Meta-regression and subgroup analysis allow you to evaluate the heterogeneity of studies. These are available via meta regress and meta forestplot, subgroup() or meta summarize, subgroup(). You can investigate potential publication bias. Check visually for funnel-plot asymmetry using meta funnelplot; formally test for funnel-plot asymmetry using meta bias; and assess publication bias using the trim-and-fill method with meta trimfill. You can even perform cumulative meta-analysis with meta summarize, cumulative(). All the meta-analysis features are documented in the new Meta-analysis Reference Manual.
The principles of Bayesian analysis date back to the work of Thomas Bayes, who was a Presbyterian minister in Tunbridge Wells and Pierre Laplace, a French mathematician, astronomer, and physicist in the 18th century. Bayesian analysis started as a simple intuitive rule, named after Bayes, for updating beliefs on account of some evidence. For the next 200 years, however, Bayes’s rule was an obscure idea. Along with the rapid development of the standard or frequentist statistics in 20th century, Bayesian methodology was also developing, although with less attention and at a slower pace. One of the obstacles for the progress of Bayesian ideas has been the lasting opinion among mainstream statisticians of it being subjective. Another more-tangible problem for adopting Bayesian models in practice has been the lack of adequate computational resources.
We consider two types of CRIs. The first one is based on quantiles. The second one is the highest posterior density (HPD) interval. An f(1 �� ) 100g% quantile-based, or also known as an equal-tailed CRI, is defined as (q=2; q1��=2), where qa denotes the ath quantile of the posterior distribution. A commonly reported equal-tailed CRI is (q0:025; q0:975). HPD interval is defined as an f(1 �� ) 100g% CRI of the shortest width. As its name implies, this interval corresponds to the region of the posterior density with the highest concentration. For a unimodal posterior distribution, HPD is unique, but for a multimodal distribution it may not be unique. Computational approaches for calculating HPD are described in Chen and Shao (1999) and Eberly and Casella (2003).
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