[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:
>Hi,
>
>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!
>
>P.S.
>I now the msm package, but think it's complex for my intention!?
>
>
>Regards,Christian
>
>
>
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>
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