Description Format Details Source Examples
The BodyWeight
data frame has 176 rows and 4 columns.
This data frame contains the following columns:
a numeric vector giving the body weight of the rat (grams).
a numeric vector giving the time at which the measurement is made (days).
an factor with levels A
to P
identifying the rat whose
weight is measured.
a factor with levels a
to c
indicating the
diet that the rat receives.
Hand and Crowder (1996) describe data on the body weights of rats measured over 64 days. These data also appear in Table 2.4 of Crowder and Hand (1990). The body weights of the rats (in grams) are measured on day 1 and every seven days thereafter until day 64, with an extra measurement on day 44. The experiment started several weeks before “day 1.” There are three groups of rats, each on a different diet.
Pinheiro, J. C. and Bates, D. M. (2000), Mixed-Effects Models in S and S-PLUS, Springer, New York. (Appendix A.3)
Crowder, M. and Hand, D. (1990), Analysis of Repeated Measures, Chapman and Hall, London.
Hand, D. and Crowder, M. (1996), Practical Longitudinal Data Analysis, Chapman and Hall, London.
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Loading required package: lme4
Loading required package: Matrix
Attaching package: 'MEMSS'
The following objects are masked from 'package:datasets':
CO2, Orange, Theoph
'data.frame': 176 obs. of 4 variables:
$ weight: num 240 250 255 260 262 258 266 266 265 272 ...
$ Time : num 1 8 15 22 29 36 43 44 50 57 ...
$ Rat : Factor w/ 16 levels "A","B","C","D",..: 1 1 1 1 1 1 1 1 1 1 ...
$ Diet : Factor w/ 3 levels "a","b","c": 1 1 1 1 1 1 1 1 1 1 ...
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