GenStat was first developed in the 1960s at Rothamsted Experimental Station for use in design and analysis of agricultural experiments and has been in continuous development since. A REML algorithm for analysis of simple multilevel models was added in 1989, and an interface to the ASREML algorithm using sparse matrix methods and an efficient updating algorithm was achieved in 1995, which also provided a wider range of variance structures for multilevel models. In the 1990s, a Windows interface was added to provide a flexible menu-driven user interface and the graphics facilities have recently been upgraded.
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