foreach var of varlist * { label variable `var' "`=`var'[1]'" replace `var' = "" if _n == 1 destring `var' , replace } drop in 1/2 cap rename Symbol Stkcd cap rename End Acc cap g year = substr(Acc,1,4) cap ren
We then obtainunexpectedreturn on assets, marketing intensity, and R&D intensity by subtracting the expected values from the actual values. Then, we define MYO, which represents myopic management, as an indicator variable thatequals one if a firm has unexpected positive ROA and unexpected negative M...
*- winsor at (p1 p99), get new variable "wage_w" . sysuse nlsw88, clear . winsor2 wage *- left-trimming at 2th percentile . winsor2 wage, cuts(2 100) trim *- winsor variables by (industry south), overwrite the old variables . winsor2 wage hours, replace by(industry south) 使用...
使用“fre”:ssc install frefre variable_name4.要快速查看每个变量有多少观测值缺失,请使用“mdesc”:ssc install mdescmdesc5.keep if inlist(state, "AL", "AK", "AZ")与下面这个语句相同:keep if state=="AL" | state=="AK" | state=="AZ"而keep if inrange(distance, 10, 91)与下面这个...
your independent variable. In the above example of test scores “males” or “females” would be your independent variable. Assumption of normality: the dependent variable should be approximately normally distributed. The dependent variable should also be measured on a continuous scale. In the ...
X = independent variable a = 截距 (常数) b = 斜率 stata实现,reg income education coefficient(coef.)为斜率b _cons 为截距a 斜率b表示:x每增加一个单位,y的变化情况 b的检验,通过判定系数R²,R²表示,在y的所有差异中,由于x的变化所解释掉的比例。是对回归方程拟合优度的度量。该统计量越接近于...
Access largest and smallest possible values of each numeric Stata variable storage type Read contents of file into string Write string to file Check whether file exists Normalize Unicode strings Search for invalid UTF-8 sequences Encode and decode strings and files to and from Base64 format...
funName variable/(var list) if/in, by() other options generate newVar=var1/var2 summarize var1 var2 newVar if group==1 regress indepVar depVar1 depVar2 depVar3,robust •任何的实证分析,收集到的数据形形色色,格式不一。 •因此,很多时候,数据清洗或者初步的数据处理成为了最重要的环节。。。
(mg/dl)如下,试比较两组的均数有无差别STATA 命令ttest x1=x2, unpairedttest x, by(g)STATA 结果ttest x1=x2,unpTwo-sample t test with equal variances---Variable | Obs Mean Std. Err. Std. Dev. [95% Conf. Interval]---+--- x1 | 14 4....
UTEST: Stata module to test for a U-shaped relationship 34 IVREGHDFE: Stata module for extended instrumental variable regressions with multiple levels of fixed effects 35 NCA: Stata module to perform Necessary Condition Analysis (NCA) 36