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Multiple datasets in memory in Stata 16
You can now load multiple datasets into memory. You type
. use people
and people.dta is loaded into memory. Next, you type
. frame create counties
. frame counties: use counties
and you have two datasets in memory. people.dta is in the frame named default, and counties.dta is in the frame named counties. Your current frame is still default. Most Stata commands use the data in the current frame. For example, if you typed
. list
then people.dta will be listed. If you typed
. frame counties: list
then counties.dta will be listed. Or you could make counties the current frame by typing
. frame change counties
and list will now list the counties data.
Navigating frames is easy and so is linking them. Imagine that both datasets have a variable named countycode that identifies counties in the same way. Type
. frlink m:1 countycode, frame(counties)
and each person in the default frame is linked to a county in the counties frame. This means you can now use the frget command to copy variables from the counties frame to the current frame. Or you can use the frval() function to directly access the values of variables in the counties frame. For instance, if we have each individual’s income in the default frame and median county income in the counties frame, we can generate a new variable containing relative income by typing
. generate rel_income = income / frval(counties, median_income)
This is the beginning. While this example uses only two frames, you can have up to 100 frames in memory at once, and you can have many links among those frames.

Stata 是一套提供其使用者数据分析、数据管理以及绘制图表的完整及整合性统计软件。它提供许许多多功能,包含线性混合模型、均衡重复反复及多项式普罗比模式。用Stata绘制的统计图形相当精美。
新版本的STATA采用具亲和力的窗口接口,使用者自行建立程序时,软件能提供具有直接命令式的语法。Stata提供完整的使用手册,包含统计样本建立、解释、模型与语法、文献等**过一万余页的出版品。
除此之外,Stata软件可以透过网络实时更新每天的新功能,更可以得知世界各地的使用者对于STATA公司提出的问题与解决之道。使用者也可以透过Stata Journal获得许许多多的相关讯息以及书籍介绍等。另外一个获取庞大资源的管道就是Statalist,它是一个立的listserver,每月交替提供使用者**过1000个讯息以及50个程序。
Stata的统计功能很强,除了传统的统计分析方法外,还收集了近20年发展起来的新方法,如Cox比例风险回归,指数与Weibull回归,多类结果与有序结果的logistic回归,Poisson回归,负二项回归及广义负二项回归,随机效应模型等。具体说, Stata具有如下统计分析能力:
数值变量资料的一般分析:参数估计,t检验,单因素和多因素的方差分析,协方差分析,交互效应模型,平衡和非平衡设计,嵌套设计,随机效应,多个均数的两两比较,缺项数据的处理,方差齐性检验,正态性检验,变量变换等。
分类资料的一般分析:参数估计,列联表分析 ( 列联系数,确切概率 ) ,流行病学表格分析等。
等级资料的一般分析:秩变换,秩和检验,秩相关等
相关与回归分析:简单相关,偏相关,典型相关,以及多达数十种的回归分析方法,如多元线性回归,逐步回归,加权回归,稳键回归,二阶段回归,百分位数 ( 中位数 ) 回归,残差分析、强影响点分析,曲线拟合,随机效应的线性回归模型等。
其他方法:质量控制,整群抽样的设计效率,诊断试验评价,kappa等。
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Advantages and disadvantages of Bayesian analysis
Bayesian analysis is a powerful analytical tool for statistical modeling, interpretation of results,
and prediction of data. It can be used when there are no standard frequentist methods available or
the existing frequentist methods fail. However, one should be aware of both the advantages and
disadvantages of Bayesian analysis before applying it to a specific problem.
The universality of the Bayesian approach is probably its main methodological advantage to the
traditional frequentist approach. Bayesian inference is based on a single rule of probability, the Bayes
rule, which is applied to all parametric models. This makes the Bayesian approach universal and
greatly facilitates its application and interpretation. The frequentist approach, however, relies on a
variety of estimation methods designed for specific statistical problems and models. Often, inferential
methods designed for one class of problems cannot be applied to another class of models.

Stata’s reporting features allow you to create Word, PDF, Excel, and HTML documents that incorporate Stata results and graphs with formatted text and tables. Regardless of the type of document you create, you can rely on Stata’s integrated versioning features to ensure that your reports are reproducible.
Want dynamic reports that are updated as your data change? Stata’s reporting features make this easy too. Rerun the command or do-file that created your report with the updated dataset, and all Stata results in the report are updated automatically.
Stata 16 has new and improved reporting features, of course, but as importantly, all of Stata's reporting features are now documented in a new Reporting Reference Manual. The manual includes many new examples that demonstrate workflows and provide guidance on customizing the Word, PDF, Excel, and HTML documents you create using Stata.
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