I have a dataframe with 25 people and their respective ages from 2012 to 2015, but in a few years the ages have not been filled.
id<-c(1:25)
idade_2012<-c(21, 18, 19, 25, 20, 12, 12, 13, 14, 29, 40, 11, 15, 14, 24, 16, 14, 12, 13, 14, 12...
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05.04.2018 / 19:46