Bill I found a workaround:
f <- ff(formula, lab)
f <- as.formula(gsub("`", "", as.character(deparse(f))))
Thanks for your elegant solution.
Frank
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Thanks Bill. The problem is one of the results of convertName might be
'Heading("Age in Years")*age' (this is for the tables package), and
as.name converts this to `Heading("...")*age` and the backticks cause
the final formula to have a mixture of regular elements and ` ` quoted
expression elements, making the formula invalid.
Best,
Frank
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--
Frank E Harrell Jr Professor and Chairman School of Medicine
Department of Biostatistics Vanderbilt University
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