corCompSymm
class,
representing a compound symmetry structure corresponding to uniform
correlation. Objects created using this constructor must be later
initialized using the appropriate
initialize
method.
corCompSymm(value, form, fixed)
t
and, optionally, a grouping factor
g
. When a grouping
factor is present in
form
, the correlation structure is assumed to
apply only to observations within the same grouping level;
observations with different grouping levels are assumed to be
uncorrelated. Defaults to `~ 1', which corresponds to using the order
of the observations in the data as a covariate, and no groups.
FALSE
, in which case
the coefficient is allowed to vary.
corCompSymm
, representing a compound
symmetry correlation structure.
Milliken, G. A. and Johnson, D. E. (1992) "Analysis of Messy Data, Volume I: Designed Experiments", Van Nostrand Reinhold.
## covariate is observation order and grouping factor is Subject cs1 <- corCompSymm(0.5, form = ~ 1 | Subject)