input str10 String Number"1"1"2"2"3"3"4"4end*导致问题**1.条件筛选 dropifString=="1"//字符型dropifNumber==1//数值型/* 字符型数据要加上引号 */**2.运算 gen Add=String+Number/* type mismatch r(109); */gen Number_2=Number gen Add=Numbe
②String a="abc"和String a=new String("abc")两种声明方式的区别 ③"abc".equals(abc)和a.equals("abc")的区别,从源码分析为什么"...从图中可以清楚的发现每个String对象的内容实际是保存到堆内存中的,而且堆中的内容是相等的。...2.两种声明...
confirm [integer] number string 不添加可选项integer时，命令用于确认输入参数为数字；加入可选项integer...
verion1.0--2/28/05--pbecapprogramdropsgmediation3programdefinesgmediation3,rclass/*sobel-goodmanmediationtests*/version15.0syntaxvarlist(max=1)[if][in],iv(varlistnumericmax=1)///mv(varlistnumericmax=1)[cv(varlistnumeric)quietly///level(integer95)prefix(string)]marksampletousemarkout`touse' `...
Stata日期和时间处理指南说明书 in Stata Gabriela Ortiz Applied Econometrician StataCorp LLC 1
Say that 'answ' contained the string "I "think" so". Then, Stata would find if "'answ'"=="yes" confusing because it would expand to if "I "think" so"=="yes" Stata would not find if '"'answ'"'=='"yes"' confusing because it would expand to if '"I "think" so"'=='"...
My main argument is that user-written Stata packages are thesource of learningadvanced Stata programming. In general, any program - whether it is written by Stata staff or a Stata user - intends to solve a problem or facilitate a task. While other users can get benefit from using the progr...
数值型(numeric),又可分为整型(integer)和双精度型(double) 逻辑型(logical),取值只能为真(TRUE)或假(FALSE) 字符型(character),夹在双引号("")或单引号('')之间的字符串(string) 此外还有一些特殊符号表示数据对象的特殊取值。 Inf,表示无穷大(infinity),负无穷大表示为-Inf。如输入1/0即可显示Inf。
Integer getValue() Returns the value of this LabelValue as an Integer. String toString() Returns a String object representing this LabelValue's value; missing values are converted to their Stata string equivalents. Methods inherited from class java.lang.Object equals, getClass, hashCode, notify,...
sdid_event Y G T D [if] [in] [, effects(integer 0) disag vce(string) brep(integer 50)] 其中: Y 是结果变量。 G 是单位/组变量。 T 是时间变量。 D 是处理变量。 与sdid一样,数据集必须是一个平衡面板,且D必须是二进制且不可逆转的处理变量,这意味着被处理的单位不能改变其处理状态。