I try to use **MixedModels.jl**.

Is any documentation how to translate SAS/SPSS random/repeated covariance type to julia MixedModels.jl notation?

for example:

```
RANDOM Fact1/TYPE=FA0(2) SUB=Fact2 G;
REPEATED/GRP=Fact1 SUB=Fact2;
```

where Fact1 and Fact2 - factors.

How to fit:

- CSH (Heterogenous compound symmetry)
- UN (Unstructured)
- VC (Variance components)
- AR1 (First-order autoregressive)

How to explain the relationship between these types and Julia MixedModels.jl notation to SAS users?