corCompSymm | R Documentation |
This function is a constructor for the corCompSymm
class,
representing a compound symmetry structure corresponding to uniform
correlation. Objects created using this constructor must later be
initialized using the appropriate Initialize
method.
corCompSymm(value, form, fixed)
value |
the correlation between any two correlated observations. Defaults to 0. |
form |
a one sided formula of the form |
fixed |
an optional logical value indicating whether the
coefficients should be allowed to vary in the optimization, or kept
fixed at their initial value. Defaults to |
an object of class corCompSymm
, representing a compound
symmetry correlation structure.
JosÃ© Pinheiro and Douglas Bates bates@stat.wisc.edu
Milliken, G. A. and Johnson, D. E. (1992) "Analysis of Messy Data, Volume I: Designed Experiments", Van Nostrand Reinhold.
Pinheiro, J.C., and Bates, D.M. (2000) "Mixed-Effects Models in S and S-PLUS", Springer, esp. pp. 233-234.
corClasses
,
Initialize.corStruct
,
summary.corStruct
## covariate is observation order and grouping factor is Subject
cs1 <- corCompSymm(0.5, form = ~ 1 | Subject)
# Pinheiro and Bates, pp. 222-225
fm1BW.lme <- lme(weight ~ Time * Diet, BodyWeight,
random = ~ Time)
# p. 223
fm2BW.lme <- update(fm1BW.lme, weights = varPower())
# p. 225
cs1CompSymm <- corCompSymm(value = 0.3, form = ~ 1 | Subject)
cs2CompSymm <- corCompSymm(value = 0.3, form = ~ age | Subject)
cs1CompSymm <- Initialize(cs1CompSymm, data = Orthodont)
corMatrix(cs1CompSymm)
## Print/Summary methods for the empty case:
(cCS <- corCompSymm()) # Uninitialized correlation struc..
summary(cCS) # (ditto)
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