I've done this from time to time. I base the strike percentage on the number of frames thrown per game. If I throw a spare in the tenth and have one fill ball, then that game would be an 11 frame game. If I throw a spare leave and miss, it would be 10- if I threw at least 2 strikes in the 10th, it would be based on 12 frames. For spares I count everything outside of splits- they would be put in another category. Sometimes I chart my single pin percentage as well (which would be a subset of the spare conversion percentage). When I have a little more expendable cash I will be getting the PDA software Frames so life would be easier to chart my progress, as it can be disruptive to the flow of bowling to try to chart every frame.

Matt

Here's an Excel program that tracks just NUMBERS.  Not where you stand, what board you hit, etc.  But I like it anyway

http://www.bowlingfans.com/downloads/stattracker.shtml
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White Dot
I don't get hot flashes.  It's just my inner child playing with matches.
http://faldo.atmos.uiuc.edu/FBL/mkting.html

I'm much the same as Pin-Nut...I haven't done any long-term tracking, but look at the numbers after each league session.

Last night- 3 games, 679
23 strikes
9 spares
3 open frames, including 2 splits

The splits were a 3-4-6-7 and a 4-9 and the other open was a 10-pin.

Those numbers have stayed pretty much the same since the begining of the year, but the series have contained roughly a 100 pin swing between high and low.  Percentages are both good and bad since the strike percentage being high does not always equate to higher series...it is all about where you put those strikes.

The author of Par Bowling: The Challenge has a great section in that book on just this subject; after looking at that, it's just math and percenatges.

Robb