search for: cond_tim

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2009 May 09
4
Generating a "conditional time" variable
...the size of my database, and considering how slow my computer is, I don't think it's practical to use it. Also, it depends on correct sorting of the dataframe, which might generate errors. ## for (i in 1:nrow(test)) { if (i == 1) { # If first id-year cond_time <- 1 test[i, 4] <- cond_time } else if ((test[i-1, 1]) != (test[i, 4])) { # If new id cond_time <- 1 test[i, 4] <- cond_time } else { # Same id as previous row if (test[i, 3] == 0) { test[i, 4]...