[R] Parse error in xtabs

[Peter Dalgaard BSA]

Andrew Perrin <aperrin at socrates.berkeley.edu> writes:

> Greetings-
> 
> Using R 1.2.2 under linux, I get the following:
> > l.agg<-xtabs(cbind(r.logic.interests, r.logic.morality,
> +                    r.logic.enlightened, r.logic.capacity,
> r.logic.mediate)
> +              ~ grouptype,
> +              data=gt)
> Error in parse(file, n, text, prompt) : parse error
> 
> 
> I know the data are structured fine, as I can use all the elements in
> individual xtabs() calls such as the one below:
> 
> > l.agg<-xtabs(cbind(r.logic.morality,r.logic.capacity) ~ grouptype,
> data=gt)
> > summary(l.agg)
> Call:
> xtabs(formula = cbind(r.logic.morality, r.logic.capacity) ~ grouptype, 
>     data = gt)
> Number of cases in table: 693 
> Number of factors: 2 
> Test for independence of all factors:
>         Chisq = 5.447, df = 4, p-value = 0.2444
> 
> Any advice?

You might try debugging it further with traceback() and debug(). It's
pretty difficult to pinpoint the cause from the information you give.

In particular, what is in "text" at the point of the crash? My first
guess was that it was parse having trouble with the argument length,
but apparently not:

>  x <- (cbind(r.logic.interests, r.logic.morality,
+  r.logic.enlightened, r.logic.capacity,
+  r.logic.mediate) ~grouptype)
> parse(text=deparse(x))
expression(cbind(r.logic.interests, r.logic.morality, r.logic.enlightened, 
    r.logic.capacity, r.logic.mediate) ~ grouptype)

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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