replace c has all characters numeric; replaced as double . d c storage display value variable name type format label variable label --- c double %10.0g 2-3 日期型变量 在STATA 中,1960 年 1 月 1 日被认为是第 0 天,因此 1959 年 12 月 31 日为第-1 天,2001 年 1 月 25 日为 15000...
数值型变量按其精度区分,又有五种类型byte | int | float | long | double //将设定一个观察值. set obs 1number of observations (_N) was 0, now 1//提示信息说,之前系统中没有观察单位,现在有了一个. gen a=1. d/*d 为 describ 命令的略写,describ 命令显示数据集的属性信息,注意观察显示结果...
32、 replaced as long /成功转换为long 型.des /注意到date 的storage type 已变为long.list date /注意到空格消失了date-1. 199912102. 200007083. 19970302/*与date 变量类似,变量price 前面有美元符号,变量percent 后有百分号,换为数值型时需要忽略这些非数值型字符。*/.destring price percent, gen(price...
本文对原作者的实证方法及结果进行调试和梳理,亦可作为教学素材作为参考。本文优化了原文代码。 在后文中,读者应重点注意如何构建扩展双向固定效应估计量。作者采用了扩展双向固定效应估计量(extended two-way fixed effects,ETWFE),由Wooldridge (2021)提出。ETWFE估计量允许处理效果在日历时间(calendar time)、进入队列...
double %10.0g 上期持股数量 LastHoldPropo~n double %10.0g 上期持股比例 LastPrice double %10.0g 上期股票价格 RightsRatio double %10.0g 期间送转增配股比例 Status byte %10.0g 增减维持标识 IndustryCode str3 %9s 行业代码 IndustryName str60 %60s 行业名称 Source byte %10.0g 数据来源 --- Sorted b...
*/ date: characters space removed; replaced as long //成功转换为 long 型 .des //注意到date的storage type已变为 long .list date //注意到空格消失了 date 1. 2. 3. /*与 date 变量类似,变量 price 前面有美元符号,变量 percent 后有百分号, 换为数值型时需要忽略这些非数值型字符。*/ ....
destring dx1, generate(num_dx1) force dx1 contains nonnumeric characters; num_dx1 generated as double (66 missing values generated) We are left with 749 distinct codes, but this is because we lost 30 distinct V-codes in 66 records. So in this prevalidated dataset, we do not have the ...
*/ date: characters space removed; replaced as long //成功转换为long 型 .des //注意到date 旳storage type 已变为long .list date // 38、注意到空格消失了 date --- 1. 19991210 2. 0708 3. 19970302 /*与date 变量类似,变量price 前面有美元符号,变量percent 后有百分号,换为数值型时需要忽视这...
*/ date: characters space removed; replaced as long //成功转换为long 型 .des //注意到date 的storage type 已变为long .list date //注意到空格消失了 date 1.2.3./*与date 变量类似,变量price 前面有美元符号,变量percent 后有百分号,换为数值型时需要忽略这些非数值型字符。*/ .destring price ...
In other words, each occurrence of"97"is replaced by an empty string; that is, they are removed. Seemacro. Then we can . reshape long `stubs',options You may need to rename some variable sets before running reshape We have seen data in which monthly temperatures were stored as variables...