kyphosis data frame has 81 rows and 4 columns.
representing data on children who have had corrective spinal surgery
This data frame contains the following columns:
a factor with levels
indicating if a kyphosis (a type of deformation)
was present after the operation.
the number of vertebrae involved
the number of the first (topmost) vertebra operated on.
John M. Chambers and Trevor J. Hastie eds. (1992) Statistical Models in S, Wadsworth and Brooks/Cole, Pacific Grove, CA.
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