Orthodont: Growth curve data on an orthdontic measurement
Description
The Orthodont data frame has 108 rows and 4 columns of the
change in an orthdontic measurement over time for several young subjects.
Arguments
source
Pinheiro, J. C. and Bates, D. M. (2000), Mixed-Effects Models in S
and S-PLUS, Springer, New York. (Appendix A.17)
Potthoff, R. F. and Roy, S. N. (1964), ``A generalized multivariate
analysis of variance model useful especially for growth curve
problems'', Biometrika, 51, 313--326.
Details
Investigators at the University of North Carolina Dental School
followed the growth of 27 children (16 males, 11 females) from age 8
until age 14. Every two years they measured the distance between the
pituitary and the pterygomaxillary fissure, two points that are easily
identified on x-ray exposures of the side of the head.