[R] classification tables

[Philippe Grosjean]

 > x <- c(1,2,3,4,2,3,3,1,2,3)
 > y <- c(2,1,3,4,1,3,3,2,2,3)
 > table(x, y)
    y
x   1 2 3 4
   1 0 2 0 0
   2 2 1 0 0
   3 0 0 4 0
   4 0 0 0 1
 > ?table

Best,

Philippe Grosjean

..............................................<°}))><........
  ) ) ) ) )
( ( ( ( (    Prof. Philippe Grosjean
  ) ) ) ) )
( ( ( ( (    Numerical Ecology of Aquatic Systems
  ) ) ) ) )   Mons-Hainaut University, Belgium
( ( ( ( (
..............................................................

Taka Matzmoto wrote:
> Dear R-users
> 
> I have two vectors. One vector includes true values and the other vector has 
> estimated values. Values are all integers from 1 to 4.
> 
> For example,
> 
> x <- c(1,2,3,4,2,3,3,1,2,3)
> y <- c(2,1,3,4,1,3,3,2,2,3)
> 
> I would like to a classfication table x by y. With the table, I would like 
> to calculate what percentage is correct classfication.
> 
> Which R function do I need to use for creating a 4 * 4 classification table?
> 
> Thank you.
> 
> Taka,
> 
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