[R] 2 time dependend states and probability transition matrix

Spencer Graves spencer.graves at pdf.com
Thu Sep 18 16:25:21 CEST 2003

I don't know if I understand what you want, but I wonder if the 
following might help: 

 > Ptrans <- data.frame(Jan=LETTERS[rep(1:2, 5)],
+ June=LETTERS[rep(1:2, each=5)])
 > (table(Ptrans$Jan, Ptrans$June)/dim(Ptrans)[1])
      A    B 
  A 0.3 0.2
  B 0.2 0.3

hope this helps.  spencer graves

Christian Schulz wrote:

>have got anybody experience or a starting
>point for me, how i can program a function 
>which calculate me a probability transition matrix with a data.frame and two states.
>I have some independend variable and  a class variable 
>for two states - in example one from Jan2003 and the same variables from June2003.
>Now i  would like to calculate the probability that PERSON X change 
>from classA to classB  between this time-period dependend from
>the independend variables.
>Until now i think about an "easy" function  what use the Bayes-Theorem, but it's too bad that i'm
>not a mathematican.
>Thanks for any starting point, idea, link or paper!
>I now the msm package, but think it's complex for my intention!?
>	[[alternative HTML version deleted]]
>R-help at stat.math.ethz.ch mailing list

More information about the R-help mailing list