CROSSTABULATION

I want to form a 3x3 crosstabulation for the signs of two vectors (i.e.
Negative, Zero, Positive). The problem is that I am simulating the data so
for some iterations one of the categories is absent. Thus the resulting
table shrinks to 3x2. I want it to be 3x3 with zero column corresponding to
the missing category. Moreover, I have tried but failed to give the
dimension names.

table(sign(rnorm(5)),sign(rnorm(5)))

sign.factor <- function(x) factor( sign(x), -1:1 )
table(sign.factor(rnorm(5)),sign.factor(rnorm(5)))

-- 
Sohail Chand

PhD Scholar
C3b Pope Building
School of Mathematical Sciences
University of Nottingham
Nottingham
NG7 2RD
UK

Lecturer (On Study Leave)
Institute of Statistics
University of the Punjab
Quaid-i-Azam Campus, Lahore (Pakistan)

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