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Issue with formula conversion

Gang Chen 
A random effect formulation for R package nlme is read in as a string
of characters from an input file:

ranEff <- "pdCompSymm(~1+Age)"

I need to convert 'ranEff' to a formula class. However, as shown below:
~1 + Age

the "pdCompSymm" is lost in the conversion. Any solutions? Thanks!

Gang

Thread (10 messages)

Gang Chen Issue with formula conversion Aug 27 David Winsemius Issue with formula conversion Aug 27 Gang Chen Issue with formula conversion Aug 27 David Winsemius Issue with formula conversion Aug 27 Gang Chen Issue with formula conversion Aug 27 David Winsemius Issue with formula conversion Aug 27 Gang Chen Issue with formula conversion Aug 27 Richard M. Heiberger Issue with formula conversion Aug 27 David Winsemius Issue with formula conversion Aug 27 Richard M. Heiberger Issue with formula conversion Aug 27