Data on the results of a spinal operation "laminectomy" on children, to correct for a condition called "kyphosis"; see Hastie and Tibshirani (1990) for details
A data frame with 81 observations on the following 4 variables.
a response factor with levels
of child in months, a numeric vector
of vertebra involved in the operation,a numeric vector
level of the operation, a numeric vector
Hastie, T. and Tibshirani, R. (1990) Generalized Additive Models. London: Chapman and Hall.