.\" -*- nroff -*- generated from .Rd format
.BG
.FN corCompSymm
.TL
Compound Symmetry Correlation Structure
.DN
This function is a constructor for the `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.
.CS
corCompSymm(value, form, fixed)
.OA
.AG value
the correlation between any two correlated
observations. Defaults to 0.
.AG form
a one sided formula of the form `~ t', or `~ t | g', specifying a time
covariate `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.
.AG fixed
an optional logical value indicating whether the
coefficient should be allowed to vary in the optimization, or kept
fixed at its initial value. Defaults to `FALSE', in which case
the coefficient is allowed to vary.
.RT
an object of class `corCompSymm', representing a compound
symmetry correlation structure.
.SH REFERENCES
Milliken, G. A. and Johnson, D. E. (1992) "Analysis of Messy Data,
Volume I: Designed Experiments", Van Nostrand Reinhold.
.SA
`initialize.corStruct'
.EX
## covariate is observation order and grouping factor is Subject
cs1 <- corCompSymm(0.5, form = ~ 1 | Subject)
.KW models
.WR
