上述代码中,_b[varname]是什么?是Stata内置的、不需要我们自己定义的变量,也叫系统变量(System variables)。Stata手册有一小节专门讲述了常见系统变量的含义(见下图)。 常见系统变量:与回归结果相关 _b[varname](也可以写成_coef[varname]):提取回归系数。
Your data are currently long. You are performing a reshape wide. You specified i(id) and j(year). There are observations within i(id) with the same value of j(year). In the long data, variables i() and j() together must uniquely identify the observations. long wide +---+ +---+...
01、Stata内置变量 特征：_variables，均已“_”开头。如：_n表示数据集观察值的序号 _N表示当前数据...
* Stata 官方命令也有专门的格式设定规则,具体可以参见手册:[D] format Set variables' output format 3.6 标签、标题与注释 esttab 命令可以帮助我们在输出的结果中使用变量标签表示变量,这非常实用,也有利于我们在数据处理阶段重识对标签的管理,规范的标签设置可以帮助我们更清楚且更有效地呈现回归结果。 代码语言:...
// display summary statistics for all variables in dataset list in 1/6 // display first 6 rows tabulate educ // tabulate `educ`variable frequencies tabulate educ female // cross-tabulate `educ` and `female` frequencies R代码块 View(wage1) ...
Using outreg2 for summary statistics: all variables in dataset Example6: stata code: cd E:\stata\results sysuse auto, clear outreg2 using 计量经济学服务中心.doc, replace sum(log) Using outreg2 for summary statistics: selected variables
打开Stata后我们便可以看到它常用的四个窗口:Stata Results; Review; Variables; Stata Command。我们所有的运行结果都会在Stata Results界面中显示;而命令的输入则在Stata Command窗口;Review窗口记录我们使用过的命令;最后Variables窗口显示存在于当前数据库中的所有变量的名称。可以直接点击 Review窗...
It works for all kinds of variables (integer, other numeric, and string). It extends easily to the apparently much more difficult problem of going through all the distinct combinations of two or more variables, which is, in fact, only a little more difficult. ...
Teaching with Stata Teaching your course with Stata provides your students with tools and skills that translate to their professional lives. Stata is affordable, is easy to use and learn, and provides all the statistics, data manipulation, visualization, and reporting that your students need. ...
Stata 18新增功能:Alias variables across frames(跨帧的别名变量) 在本节中,作者将描述如何使用别名变量以高效内存的方式跨帧访问变量。 不同frame 中的两个数据集可以通过具有匹配变量来关联。如前所述,可以通过基于公共变量将当前 frame 中的观测值与相关 frame 中的观察值进行匹配,将 frame 与 frlink 链接起来...