Orthodont: Orthodont dataset from R-package 'nlme'

Description Usage Format References

Description

The Orthodont data frame has 108 rows and 4 columns of the change in an orthdontic measurement over time for several young subjects.

This dataset was included to simplify its usage in automated unit-tests (see directory UnitTests) and examples.

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.

Usage

1

Format

data.frame with 80 rows and 3 variables.

References

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.


VCA documentation built on July 12, 2017, 5:02 p.m.

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