This function is deprecated. Please see cosy for the new syntax.
This functions is a constructor for the cor_cosy class, representing
a compound symmetry structure corresponding to uniform correlation.
Arguments
- formula
A one sided formula of the form
~ t, or~ t | g, specifying a time covariatetand, optionally, a grouping factorg. A covariate for this correlation structure must be integer valued. When a grouping factor is present informula, 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.