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untrace
2001 Nov 27
2
R/S and large datasets - Database access (also Re: SAS and S/R)
...). Other cases
(nonlinear mixed effects models come to mind) are not as easily tamed
(any iterative process (shuch as ML estimation) has to get back to
original data), but at least, the time penalty involved in the use of
such an interface pays back by allowing you to treat problems otherwise
untractable.
I am aware of at least one database access package that allows to access
data without dragging a whole table in memory : the RPgSql package
offers what it calls a "proxy variable", which is an objet that behaves,
for all practical purposes, as a dataframe, but is an interface to...