值得信任
技术支持
我们不仅编写统计方法，我们还会进行验证。
您能从Stata estimator rest与其他估计的比较中看到Monte-Carlo模拟的一致性和覆盖率以及我们统计学家们进行的广
泛测试。每一版的Stata软件，我们都通过了各种认证，包括230万行的代码测试，并产生了430万行的结果输出。我们验
证了这430万行代码中的每一个数字和每一段文字。
Stata公司的技术团队对注册用户提供免费服务。而这远比您付的费用得到的更多。
我们有专门的Stata程序员和统计学家来回答您的技术问题。从棘手的数据管理方案到让您做出**的图表；从解释大
量的标准错误到指导您进行多层模型，我们都在认真回答您的问题。
系统要求
■ Stata for Windows
■ Stata for Mac
■ Stata for Linux
Windows 10* / Windows 8* / Windows 7* / Windows Vista* / Windows
Server 2016, 2012, 2008, 2003 * ；* 64-bit and 32-bit Windows varieties for
x86-64 and x86 processors made by Intel® and AMD Find out if your OS is
64-bit compliant.
Stata for macOS requires 64-bit Intel® processors (Core™2 Duo or better)
running macOS 10.9 or newer Find out if your OS is 64-bit compliant.
Any 64-bit (x86-64 or compatible) or 32-bit (x86 or compatible) running
Linux For xstata, you need to have GTK 2.24 installed
Panel-data ERMs
Extended regression models (ERMs) were a big new feature last release. The ERM commands fit models that account for three common problems that arise in observational data—endogenous covariates, sample selection, and treatment—either alone or in combination.
In Stata 16, we introduce the xteregress, xteintreg, xteprobit, and xteoprobit commands for fitting panel-data ERMs. This means ERMs can now account for the three problems we mentioned above and for within-panel correlation. These new commands fit random-effects linear, interval, probit, and ordered probit regression models. They allow random effects in one or all equations, and they allow random effects to be correlated across equations.
Researchers from all disciplines who work with observational (nonexperimental) data are interested in ERMs and will be excited about the new panel-data versions of these commands. However, different disciplines talk about these models differently.
Above, we referred to the problems ERMs solve as endogenous covariates, sample selection, treatment, and within-panel correlation. While this terminology is common in some disciplines such as economics, other disciplines may use other terms.
• Instead of panel-data and within-panel correlation, researchers may ask for models for multilevel (two-level) data that account for within-group correlation.
• Instead of endogenous covariates, researchers may ask for methods of dealing with unobserved confounding or unmeasured confounding.
• Instead of sample selection, researchers may be concerned about trials with informative dropout, nonignorable nonresponse, or outcomes missing not at random (MNAR).
• Instead of treatment, researchers may ask about methods for causal inference or estimating average treatment effects (ATEs).
The important message is that all disciplines are interested in ERMs, but they often speak different languages.
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功能中不可或缺的一部
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
特殊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。
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