I believe there are scripts available to calculate the statistics for a tiddler, but I cannot seem to locate them. If you have written such a script or know of a link to a solution, please share it here.
NOTE i: For one tiddler page has no meaning (but for whole wiki it can be number of non-system tiddlers)
NOTE ii: A form of this can be seen in edit mode
MOTE iii: A complete form can be displayed on clicked word counts button at the bottom of tiddler.