Data from a sociological study, the number of days absent from school is the response variable.
data("schooldays")raceaboriginal and non-aboriginal.genderfemale and male.schoolF0 (primary), F1 (first), F2 (second) and  
        F3 (third form).learneraverage and
                          slow.absentThe data arise from a sociological study of Australian Aboriginal and white children reported by Quine (1975). In this study, children of both sexes from four age groups (final grade in primary schools and first, second and third form in secondary school) and from two cultural groups were used. The children in age group were classified as slow or average learners. The response variable was the number of days absent from school during the school year. (Children who had suffered a serious illness during the years were excluded.)
  data("schooldays", package = "HSAUR3")
  plot.design(schooldays)
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