[Orgmode] After TODO statistics problem

[David Lee]

Hi all,

I add CNCL(cancel) and WAIT to TODO keywords, which is copied from 
Prof.Dominik's presentation.

In below example, the statistics of TODO should be [1/3] (because CNCL 
should not be considered as a valid headline), but not [1/4].

How to omit the CNCL headline? Shall I modify value or add a hook?

(example modified from Org Mode Manual Section 5.5)

* Organize Party [1/4]
** TODO Call people [1/2]
*** TODO Peter
*** DONE Sarah
** WAIT Buy food
** DONE Talk to neighbor
** CNCL Waste time

My environment is Emacs 23.1, Org 6.36.

Thanks,
 - David