r - Dummy variable with time and id condition in long panel -


i'm trying add dummy variable panel data set time, id , many other variables.

library(zoo) geo = c("at","at","at","be","be","be","de","de","de") time = c("1990q1","1990q2","1990q3","1990q1","1990q2","1990q3","1990q1","1990q2","1990q3") data <- as.data.frame(cbind(geo, time)) data$time = as.yearqtr(data$time)

which in reality has 20 countries , 97 quarters. wont around addressing 'geo' element element (time > 2004q1) example great

i want dummy austria , germany starting in 1990 q2. arrive at:

    geo time     dummmy 1   @  1990 q1  0 2   @  1990 q2  1 3   @  1990 q3  1 4    1990 q1  0 5    1990 q2  0 6    1990 q3  0 7   de  1990 q1  0 8   de  1990 q2  1 9   de  1990 q3  1

i cant anywhere close, i'm thinking in stata logic (generate variable if , else) closest in r create separate country dummies, cbinding each time variable , subsetting them on time variable before extracting single dummies , adding them before cbinding original data. cannot anywhere close best solution (and doesn't work) because around 40 lines of code... should quite easy do, no?

any great!

p.s.: attempts go along these lines:

at <- as.numeric(data$geo == "at") de <- as.numeric(data$geo == "de")  @ <- as.data.frame(cbind(data$time, at)) de <- as.data.frame(cbind(data$time, de))

but think i'm off wrong direction , cant time dimension right...

it looks must using zoo library as.yearqtr function. if that's case, makes "time" column comparable standard comparison operators. looks want values time>"1990q1" , "geo" either "at" or "de". can with

data$dummy<-(data$time>as.yearqtr("1990q1") & data$geo %in% c("at","de"))+0

here +0 turn logical true/false 0/1


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