Hi, I need help writing a function
I capture seal pups mutliple times during the lactation season in order to monitor their growth rate. When I release them, the recovery (mother-pup) time is not the same for all individuals. I want to know if individuals that recover their mother the fastest are the ones with the highest growth rates. So, I noted at every release if the pup reovered his mother before we leave (yes or no). My dataframe looks like this Capture nb individual individual capture motherrecovery growth rate 1 1 1 n 0.5 2 1 2 y 0.5 3 1 3 y 0.5 4 1 4 y 0.5 5 1 5 n 0.5 6 2 1 y 0.3 7 2 2 y 0.3 8 3 1 y 0.4 9 3 2 n 0.4 10 3 3 y 0.4 ... I want to calculate a rate of mother recovery by individual, i.e. nb of recoveries (y)/nb of captures. So for indivial 1 it would be 3/5 = 0.6. I want to write a function that does this for all the individuals in my dataframe, i.e. around 400 individuals (this is why I want to write a function, it would be too long by hand) Thank you, Joanie Van de Walle Ãtudiante à la Maîtrise en Biologie Département de Biologie 1045, avenue de la Médecine Pavillon Vachon, bureau 2044 Université Laval Québec, Canada, G1V 0A6 ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
