R help - Nov 2008 - 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.
-- 
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)

	[[alternative HTML version deleted]]

Hello...

Which code are you using to perform the breakup into the three classes?
Can you be more specific on that?

Best regards,

Carlos J. Gil Bellosta
http://www.datanalytics.com


On Thu, 2008-11-13 at 09:57 +0000, 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.

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)
>
> 	[[alternative HTML version deleted]]
>
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>
Charles C. Berry                            (858) 534-2098
                                             Dept of Family/Preventive Medicine
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