** ^HELP ON CUMULATIVE POISSON PROBABILITY CALCULATION
      ^Joseph Hilbe - Stata Technical Bulletin  *** May 1991

The cpoisson.ado file acts similar to a function in that a single answer
results. The call is...

   ^cpoisson ^<^population ratio^>^ ^<^total observations^>^ ^<^cases^>

See epoisson.hlp for details. An example might appear as...

     ^cpoisson .03 845 20                 
     ^Cumulative poisson probability => .88035984