nested anova

[Manoel Pacheco <mpacheco@glec.com>]

Every time I attempt to run the model

cd.aov <- aov(lc50 ~ family + family/genus + genus/sp, data=becd)

S-plus crashes. It keeps on running and never generates a result. When I 
try to run the same model in R, it crashes as well. The data frame becd 
has 578 rows; lc50 is a numeric variable and family, genus, and sp are 
factors.  I am using S-plus 6.2 in a Windows operating system. My pc has 
one gigabyte of RAM.
 Is the problem related to the large number of rows or am I setting up 
the model wrong?
Thanks,
        Manolo