Orthodontic Measurements on Children

SUMMARY:

The Orthodont data frame has 108 rows and 4 columns giving an orthodontic measurement on 11 girls and 16 boys at 4 different ages.

DATA DESCRIPTION:

This data frame contains the following columns:

VALUE:

Subject
a factor identifying the subject on whom the measurement was made.
Sex
a factor indicating if the subject is male or female.
age
the age of the subject when the measurement is made (years).
distance
the distance from the center of the pituitary to the pterygomaxillary fissure (mm).

SOURCE:

These data are given in Potthoff and Roy (1964), "A generalized multivariate analysis of variance model useful especially for growth curve problems", Biometrika, 51, 313. They were originally collected by investigators at the University of North Carolina Dental School.

SEE ALSO:

, , .

EXAMPLES:

Orthodont.lis <- lmList(distance ~ age, data = Orthodont, 
                   cluster = ~ Subject) 
Orthodont.lme <- lme(Orthodont.lis)