Data Set of Tonsil Size in Children
Children have been classified according to their relative tonsil size and wheater or not they are carriers of Streptococcus pyogenes.
data(tonsil)
A data frame with 6 observations on the following 3 variables.
a factor with levels carriers noncarriers
numeric, 1, 2 or 3, tonsil size
number of children in group
It may be assumed that tonsil size always starts in the normal state "present but not enlarged" (category 1). If the tonsils grow abnormally, they may become "enlarged" (category 2), if the process does not stop, they may become "greatly enlarged" (category 3).
Ludwig Fahrmeir, Gerhard Tutz (1994): Multivariate Statistical Modelling Based on Generalized Linear Models. Springer Series in Statistics. Springer Verlag. New-York Berlin Heidelberg
str(tonsil) summary(tonsil)
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