Growth curve data on an orthdontic measurement
Orthodont data frame has 108 rows and 4 columns of the
change in an orthdontic measurement over time for several young subjects.
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.
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.
data(Orthodont) formula(Orthodont) plot(Orthodont)