Good afternoon, I am studying R in Ubuntu (16.04 LTS). When trying to use the strata function through the command below:
amostra = strata(infert, c("education"), size = c(5, 48, 47), method = "srswor")
The error below occurs:
Error in strata (infert, c ("education"), size = c (5, 48, 47), method="srswor"): could not find strata function
R version in Ubuntu R version 3.4.2 (2017-09-28) - "Short Summer"
Some functions we use in R are not associated with base package .
So we should install the package that developed the function we want using install.packages("nome do package") and then call the package using library(nome do package) .
If you do not know the name of the package, you can use the findFn() function of package sos .
install.packages("sos") # se ainda não instalou o package
library(sos)
findFn("strata", maxPages = 1)
EDITED :
According to Rui Barradas, the package is probably sampling .