> From: Susana Bird > > Dear all, > > my problem is following. I know Stata, but currently I have > to use R.
I have the opposite of your problem: I don't know Stata, but I don't have to use Stata. 8-) > Could You please help in finding the analogy to R. > > (1) creating of City-Dummy. > > I know in Stata: > > g byte city=0 > replace city=1 if city==12&year==2000 > > and > > (2) Create a Time-Dummy-Variable > > g byte T2000=0 > replace T2000=1 if year==2000 Because I don't know Stata, I'm not sure what those commands do, but I'll take a crack at guessing anyway. If `year' is a vector of numbers, you can do something like: T2000 = ifelse(year == 2000, 1, 0) [Your #1 above doesn't quite make sense to me: If you initialize `city' to 0, how do you condition on city == 12? Anyway, the same idea should apply: use ifelse().] > (3) I need the City DUmmy for the following combination: I > have the financial flows between two cities in the state and > I need the paired-Dummy for the exporter (state1) and > importer (state2): > > g byte city11=0 > replace city11=1 if state1==12|state2==12 Seems to me that ifelse() will work here, too. > (4) I am interesting in residuals for particular city==12. I > have the Dummy for City==12 and regress it on Y-Variable. How > could I extract from the output in R the residulas for > city==12 (1) to plot this residuals and residuals from other > regions in boxplot and (2) to etsimate the confidence interval. Something like: resid(regModel)[city==12] HTH, Andy > Thanks very much in advice, > > Susan > > > > > > > --------------------------------- > > > [[alternative HTML version deleted]] > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > > ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
