Thanks to Richard Heiberger, John Fox, and Avi Gross, who pointed out to me that I should
use double brackets [[ ]]
xxx[[2,3]]
$a [1] "n" $b [1] 20
I really should've should've known that; I feel a bit duh now! See fortunes::fortune(341) for a relevant comment. :-) Thanks again. cheers, Rolf Turner
Honorary Research Fellow Department of Statistics University of Auckland Phone: +64-9-373-7599 ext. 88276