Simple Cases of Multi-Level Models

While much has been made of multi-level models, and specialized software for such models, in many cases standard methods can be used in estimating these models. Use of such standard methods is faster and easier, in many cases, than use of specialized software; futher, use of standard methods helps clarify what these models actually are estimating. I limit my discussion here to linear regression models and include a new ado file that puts together the steps to match multi-level models, in certain cases. If time allows, a comparison with the much slower gllamm6, for these limited situations, will be briefly presented.