[R] comparision among multiple subgroups

[sdzhangping]

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