[R] max length of a factor variable

bennose ben at surveyengine.com
Fri May 17 17:18:10 CEST 2013

Technically this is correct for raw R functionality.

in practice various modules impose their own limits on variables so you have
to check.
For example the coxreg package truncates all variables to 16 characters.

for example the test below
> res
coxreg(formula = Surv(vtime, vstatus) ~
abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz1_fx1 + 
    alt_const_fx1 + alt_const_fx2 + strata(vstrata), data = aggregate)

Covariate           Mean       Coef     Rel.Risk   S.E.    Wald p
abcdefghijklmnop   -0.000        NA        NA     0.000        NA 
alt_const_fx1      -0.045     0.132     1.141     0.044     0.002 
alt_const_fx2      -0.024     0.011     1.011     0.045     0.801 

View this message in context: http://r.789695.n4.nabble.com/max-length-of-a-factor-variable-tp2715509p4667332.html
Sent from the R help mailing list archive at Nabble.com.

More information about the R-help mailing list