缺失值

mdesc -- Displays the number and proportion of missing values for each variable in varlist.

mdesc varlist [if] [in] [, abbreviate(#) any all none ]

misstable -- Tabulate missing values

* Report counts of missing values
    * misstable summarize [varlist] [if] [in] [, summarize_options]
* Report pattern of missing values
    * misstable patterns [varlist] [if] [in] [, patterns_options]

nmissing

ssc install nmissing//安装外部命令nmissing
ssc install npresent//安装外部命令npresent
nmissing//统计数据缺失的变量
npresent//统计没有数据缺失的变量

数据整理

iefieldkit

iefieldkit: Commands for primary data collection and cleaning

Data collection and cleaning workflows implement highly repetitive but extremely important processes. In this article, we introduce iefieldkit, a package developed to standardize and simplify best practices for high-quality primary data collection across the World Bank’s Development Research Group Impact Evaluations department. iefieldkit automates error-checking for electronic Open Data Kit-based survey modules such as those implemented in SurveyCTO; duplicate checking and resolution; data cleaning, including renaming, labeling, recoding, and survey harmonization; and codebook creation.

回归

**aaplot ** 自动对散点拟合线性或二次项

Scatter plot with linear and/or quadratic fit, automatically annotated