R help - Jul 2009 - comparision among multiple subgroups

Dear R users:

    In my recent works, I compared the cumulative incidences among three
different treatment groups. The cuminc function (cmprsk package ) yielded a
graph (refer to figure 1) and a p value (p = 0.0007). I don?t know how to
interpret the meaning of the p value ( one p value and three subgroups) ?
Similar puzzles exist in log-rank test of survival data (figure 2).

   What dose the meaning of p value in these conditions? What packages and
functions should I apply?

   thanks 

  Ping Zhang

Dear R users:

    In my recent works, I compared the cumulative incidences among three
different treatment groups. The cuminc function (cmprsk package ) yielded a
graph (refer to figure 1) and a p value (p = 0.0007). I don?t know how to
interpret the meaning of the p value ( one p value and three subgroups) ?
Similar puzzles exist in log-rank test of survival data (figure 2).

   What dose the meaning of p value in these conditions? What packages and
functions should I apply?

   thanks 

  Ping Zhang






200????,????,?????

On Jul 4, 2009, at 11:36 AM, sdzhangping wrote:
> Dear R users:
>
>    In my recent works, I compared the cumulative incidences among  
> three different treatment groups. The cuminc function (cmprsk  
> package ) yielded a graph (refer to figure 1)
No figure attached. Perhaps it did not conform to the rules in the  
Posting Guide and so was scrubbed before distribution?
> and a p value (p = 0.0007). I don?t know how to interpret the  
> meaning of the p value ( one p value and three subgroups) ? Similar  
> puzzles exist in log-rank test of survival data (figure 2).
>
>   What dose the meaning of p value in these conditions?
Hard to tell. No data or output is visible to the list readers.
> What packages and functions should I apply?
To do what?
>
>   thanks
>
>  Ping Zhang


David Winsemius, MD
Heritage Laboratories
West Hartford, CT