Both have conspired against me to insure that I never really get any work done.
Case in point: A discussion topic is thrown out there, and rather than do something like double check finances so we know money isn’t missing, I create a trending chart.
For those of you who don’t know, a trending chart is basically taking a value (could be anything from K’s to weight), and expresses it over a period of time, using a line graph. I’m a big fan of them as they pertain to baseball. Baseball stats are just a form of accounting. If you can measure the accounting with any reliability, you can predict the future. It’s fun really, especially if you call it your gut calling. “My gut tells me Bellhorn will put up an OBP of about 370 this year…” I made 10 bucks on that call.
I digress. Trending charts are useful in player to player comparisons. If you have two similar players, say Keith Hernandez and Mark Grace, and they have similar charts, you can make up “rules” along the lines of career length for high-OB%, ave-slug, good D first basemen.
Usually, with these charts, the value I use is actually from Clay Davenport. Normally, I hate using numbers I don’t figure out myself, simply because I like the accountability that goes along with them. However, Davenport does two things that I haven’t or are unable to do. The first is adjust his numbers for all time (park and era). The second is he has codified defensive numbers.
The best way to see these numbers is to go to Baseball Prospectus’s web site (BPro), enter a player into the search bar, and click on DT cards.
To find the numbers I use, scroll down to Advanced Batting Statistics, look to the right where it says “Adjusted for all time” and use BRAR (batting runs above replacement) and FRAR (fielding runs above replacement). Add those two together and you get a raw run value. I like that because it puts all players on an even ground in which to judge. I use PRAR (figure it out) for pitching.
Why is this all relevant? Well I took two players that I wanted to compare over 4 years. Player A was a 27 year old rookie who is currently playing. Player B is a Hall of Famer. Here is their trending chart for their Age 27 to Age 30 seasons:

Now the astute among you might know who these two are. I won’t reveal them yet.
Since this takes park/era/defensive prowess into account, you would have to assume that player B would be far and away the better hitter, and the more likely to have the longer career.
Why?
Because through his prime, B played at a higher level. They right now are being judged using the same (adjusted) criteria.
In other words, Ichiro isn’t nearly the player Wade Boggs was.
This special type of accounting that people who love baseball use is an odd thing. The exact same number can be used to lionize and demonize the same player. Not only that, the numbers are conveniently ignored with respect to some factors, such as Boggs being called a “guy who only walks and singles” when he had legit power, something Ichiro hasn’t shown in Major League Baseball yet.
Sometimes a picture is better than words.