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pr_debug
2003 Mar 26
5
predict (PR#2686)
...;t occur in the prediction data either. (At
least if `drop.unused.levels' was set to TRUE, which the default.)
test> scrunge.data.2_ data.frame( y=runif( 3), disc=factor( c( 'cat', 'dog',
'cat'), levels=c( 'cat', 'dog', 'earwig')))
test> lm.predbug.2_ lm( y~disc, data=scrunge.data.2)
test> predict(lm.predbug.2, newdata=scrunge.data.2)
Error in model.frame.default(object, data, xlev = xlev) :
factor disc has new level(s) earwig
A cure for this seems to be to add the commented line below towards the end
of `model.frame.default'...