Shults, Justine; Ratcliffe, Sarah J.; Leonard, Mary - In: Stata Journal 7 (2007) 2, pp. 147-166
-written program xtqls in Stata. Also, it demonstrates the following advantages of QLS: (1) QLS allows some correlation structures that … programs already available for GEE. In particular, xtqls calls the Stata program xtgee within an iterative approach that … current estimate of alpha. The benefit of this approach is that after xtqls, all the usual postregression estimation commands …