The problem I have is that stata does not consider missing values when computing the variance. If i write the code: by isin: egen variance20001230=var(price) if datum>=20000101 & datum< 2000123 0 this gives me the 1-year variance for every stock between 200010101 and 20001230. However it...
Re: st: How can I replace missing values with the variable's first nonmissing value? From: Nick Cox <njcoxstata@gmail.com> Prev by Date: re: Re: st: Prop.score matching: assess significance t-value + slow kernel matching Next by Date: st: flexible parametric models in small datasets...
Stata 中, gen 和 egen 是最常用的变量生成的命令,与之对应,replace 和 ereplace 则是最常用的取值替换的命令是。其中,gen 和 replace 的用法比较简单,ereplace 的多数用法与 egen 相同,这里主要介绍 egen …
stata数值型转化为字符型:tostring.webuse tostring,clear .des .list .tostring year day,replace.des .gen date1=month+”/”+day+”/”+year //.list.gen date2=date(date1,”mdy”)最后一行不是计算从那天起直到括号中指定的某天date1一共过了多少天,为什么我的date2数据生成不了呢?还说(10 missing ...
stata数值型转化为字符型:tostring.webuse tostring,clear.des.list.tostring year day,replace.des.gen date1=month+”/”+day+”/”+year //.list.gen date2=date(date1,”mdy”)最后一行不是计算从那天起直到括号中指定的某天date1一共过了多少天,为什么我的date2数据生成不了呢?还说(10 missing values...
Stata's heckman command is a good example of this. In such cases, there will be observations where missing values are allowed and other observations where they are not—where their presence should cause the observation to be eliminated. If you specify missing, it is your responsibility to ...
I have two variabled called "prean" and "pa_kum" that contain missing values. These missing values i would like to replace by 0 (zero). What command can i use to do this? Thanks in advance for your support. Regards -- View this message in context: http://statalist.1588530.n2....
Re: st: How can I replace missing values with the variable's first nonmissing value? From: Nick Cox <njcoxstata@gmail.com> Prev by Date: st: replace missing values of a variable with the median of that variable based on particular criterion Next by Date: Re: st: margins dydx for ...
http://www.ats.ucla.edu/stat/stata/ Follow-Ups: Re: st: RE: RE: Replace missing values by 0 From: David Bell <dcbell@iupui.edu> st: RE: RE: RE: Replace missing values by 0 From: "Lachenbruch, Peter" <Peter.Lachenbruch@oregonstate.edu> References: st: Replace missing ...
To statalist@hsphsun2.harvard.edu Subject Re: st: merge: replace values with missings Date Fri, 23 Mar 2012 10:20:39 +0100Marc, I do not see a way to get -merge- to do this, but I would not worry too much about "detecting all cases" when doing this "by hand". Here are two...