Suppose the following table:
tabela <- structure(list(Sexo = structure(c(1L, 1L, 2L, 2L), .Label = c("Homem",
"Mulher"), class = "factor"), Grupo = structure(c(1L, 2L, 1L,
2L), .Label = c("A", "B"), class = "factor"), Média = c(0.26550866...
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08.03.2014 / 02:13