On Thu, 13 Nov 2008, Sohail wrote:
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.
See
?factor
Something like this might be what you want:
table(sign(rnorm(5)),sign(rnorm(5)))
-1 1
-1 1 1
1 1 2
sign.factor <- function(x) factor( sign(x), -1:1 )
table(sign.factor(rnorm(5)),sign.factor(rnorm(5)))
-1 0 1
-1 0 0 4
0 0 0 0
1 0 0 1
HTH,
Chuck
--
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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