time variable: year, 68 to 88, but with gaps delta: 1 unit 变量加工与描述性统计: xtdescribe g age2= age^2 g ttl_exp2=ttl_exp^2 g tenure2=tenure^2 global xlist "grade age age2 ttl_exp ttl_exp2 tenure tenure2 not_smsa south race" sum ln_w $xlist 2. 传统DID 在这个数据集中...
*Create a dummy variable to identify the group exposed to the treatment. In this example lets assumed that countries with code 5,6, and 7 were treated (=1). Countries 1-4 were not treated (=0). If you already have this skip this step生成地区的虚拟变量 gen treated = (country>4) & ...
display “{center: The use of {ul:SMCL} in help files}” display “{text}the variable mpg has mean {result: 21.3} in the sample” display “{text}mpg {c |} {result}21.3” display “{text}mpg {c |} {result:21.3}” display “error: variable not found” display “{txt}the variab...
treat_post:基准回归的DID变量 asinhso2_i:这篇文章的因变量,企业硫排放的反双曲正弦 firm:企业代码 ind4_fe:行业代码 area2_fe:地区代码 此外,需要确保这是一个公司年面板数据结构 . xtset firm year Panel variable: firm (unbalanced) Time variable: year, 2004 to 2013, but with gaps Delta: 1 unit...
{text}the variable mpg has mean {result: 21.3} in the sample" display "{text}mpg {c |} {result}21.3" display "{text}mpg {c |} {result:21.3}" display "error: variable not found" display "{txt}the variable mpg has mean {res:21.3} in the sample" display "When using the {cmd:...
regress gp100m weight foreing variable foreing not found r(111); . end of do-file The do "/tmp/. . . " command is how Stata executes the commands in the Do-file Editor. Stata saves the commands from a do-file with unsaved changes to a temporary file and issues the do ...
/* syntax 3 */ .sysuse auto,clear(1978 Automobile Data) .rename price Price.sem (X -> mpg displacement length Price)model not identified; no paths from latent variable Price to observed variablesr(503); semis assuming thatPriceis a latent variable; if that was the case, the model wouldn...
(contacting http ://www .stata .com) host not found http ://www .stata .com did not respond or is not a valid update site unable to check for update ; verify Internet settings are correct. 1 . *(3 variables, 84 observations pasted into data editor) 2 . rename var1 y 3 . ...
differentiate between several situations.For example if one has a categorical variable representing if the person passed a test, you could have 0 for did not pass, 1 for pass, and as user defined missing variables 2 for did not show up for the test, 3 for unable to process the results,...
the current frame. New variablecountiesis created in this case. If I were to drop the variable, I would eliminate the link, but I’m not going to do that. I’m curious whether the counties in which people reside in persons.dta were all found in counties.dta. I can find out by ...