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.

`cor_cosy(formula = ~1)`

- formula
A one sided formula of the form

`~ t`

, or`~ t | g`

, specifying a time covariate`t`

and, optionally, a grouping factor`g`

. A covariate for this correlation structure must be integer valued. When a grouping factor is present in`formula`

, 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.

An object of class `cor_cosy`

, representing a compound symmetry
correlation structure.

```
cor_cosy(~ visit | patient)
#> cosy(~visit | patient)
```