[R] Poisson Regression

[Meles MELES]

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Hi,
        somebody asked me to do a Poisson regression on cancer incidence over
years to see wether if there is a descending or an ascending tendancy.
I tried with R, but it complains that the data are not integer but
floating poing data. So, as I never did that sort of thing before, I'm a 
bit lost.

the data serie looks like this
SEX  PERIOD     INCIDENCE
1    [1978;1982]  57,3
1    [1983;1987]  58,3
1    [1988;1992]  65
1    [1993;1997]  56,8
2    [1978;1982]  4,6
2    [1983;1987]  5
2    [1988;1992]  5,1
2    [1993;1997]  6,2

Any suggestions?

Thanks a lot
- -- 
La publicité, c'est la science qui consiste à interrompre
les processus du cerveau le temps de lui piquer du fric.
Stephen Leacoch
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