Ahoy. I'm trying to run a function for each country in a multinational
dataset. Keeping it simple, an example is
for(j in 11:14) {
if(data$country_str == "j") {
mu <- mean(data$ecdfs1)
} else {
mu <- 0
}
}
The number of countries is greater and the functions are more complex, but
this fails just the same. The consistent error is
In if (data$country_str == "j") { :
the condition has length > 1 and only the first element will be used
Using the inelegantly workable
if(data$country_str == "11") {
mu <- mean(data$ecdfs1)
} else {
mu <- 0
}
And repeating manually I still get the same error.
For those who know both, in Stata I did this with the foreach command (but
I don't trust Stata's results for my ML estimates), although for summary
statistics the bysort command would be appropriate. I can't find a clear
analog in R.
Can anybody explain just what the error is, and how to fix it? Which
'condition' is inappropriately lengthed - the country string or the values
it takes?
Neither the manual nor examples online match my problem - or at least not
apparently to me. I've tried an ifelse but it runs the functions for every
observation depending upon whether or not the condition is met. I only
want 13 sets of output, not 30,000.
Do I need to just break my dataset up into the countries and do it the
long way?
Much appreciated, thank you.
Casey
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