R help - Apr 2011 - Creating a symmetric contingency table from two vectors with different length of levels in R

Hello,
How can I create a symmetric contingency table from two categorical vectors
having different length of levels?
For example one vector has 98 levels
TotalData1$Taxa.1
 [1] "Aconoidasida"                     "Actinobacteria
(class)"
"Actinopterygii"                   "Alphaproteobacteria"
 [5] "Amoebozoa"                        "Amphibia"
"Anthozoa"                         "Aquificae (class)"
and so on .........
98 Levels: Aconoidasida Actinobacteria (class) ....

  and the other vector has 105 levels
TotalData1$Taxa.2
    [1] Flavobacteria                    Proteobacteria
Bacteroidetes/Chlorobi group     Bacteria
    [5] Epsilonproteobacteria            Epsilonproteobacteria
 Epsilonproteobacteria
and so on  ..........
105 Levels: Acidobacteria Aconoidasida Actinobacteria (class) ....

Now I want to create a symmetric contingency table.
Any quick idea will be really helpful.
Best regards,
Mitra

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Hi:

Here is one solution:

a<-factor(c(1,2,4,5,6))
b<-factor(c(2,2,4,5,5))
b1<-factor(b,levels=c(levels(b),levels(a)[levels(a)%in%levels(b)==FALSE]))
table(a,b1)

but be aware that levels of b is a subset of levels of a.

Andrija

On Wed, Apr 6, 2011 at 10:39 AM, suparna mitra <
mitra@informatik.uni-tuebingen.de> wrote:
> Hello,
> How can I create a symmetric contingency table from two categorical vectors
> having different length of levels?
> For example one vector has 98 levels
> TotalData1$Taxa.1
>  [1] "Aconoidasida"                     "Actinobacteria
(class)"
> "Actinopterygii"                  
"Alphaproteobacteria"
>  [5] "Amoebozoa"                        "Amphibia"
> "Anthozoa"                         "Aquificae (class)"
> and so on .........
> 98 Levels: Aconoidasida Actinobacteria (class) ....
>
>  and the other vector has 105 levels
> TotalData1$Taxa.2
>    [1] Flavobacteria                    Proteobacteria
> Bacteroidetes/Chlorobi group     Bacteria
>    [5] Epsilonproteobacteria            Epsilonproteobacteria
>  Epsilonproteobacteria
> and so on  ..........
> 105 Levels: Acidobacteria Aconoidasida Actinobacteria (class) ....
>
> Now I want to create a symmetric contingency table.
> Any quick idea will be really helpful.
> Best regards,
> Mitra
>
>        [[alternative HTML version deleted]]
>
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