Measuring runs per game cost of defensive difference?

[UrbanShockers]

Diamond Dope tells us the RPG differential between two players in a given park (based on rolls on their own cards). Is there any similar resource that tells us the RPG cost of their defensive difference?

Eg, I have two SS candidates. Against RHP, DD tells me one will produce about 7.8 RPG, the other about 5.5, in a big homer park: figure, taking pitcher card rolls into account, about a run a game. But the 5.5 guy is a 2e21, the 7.8 guy is a 4e32. Any way I can roughly quantify what that costs me per game? A run a game seems like a lot, but I dunno.

[MARCPELLETIER]

Correct me if I am wrong, those numbers (5.5, 7.8 ) represent the value of the hitter IF all 9 hitters of your line-up were similar to this player (that is the case if the number comes from RC/27). So to know the real difference between the two players, you have to divide by 9 the difference (7.8-5.5), so the real difference is probably 0.26 runs per game.

I am guessing that this is true for your home games only. You should also calculate the difference for the average road game.

There was a site that could provide you with the info for defense, but I calculated for you. If I am not wrong, a ss4e32 should allow about 0.34 singles per game in addition to what a ss2e21 would allow. The value of a single is worth about 0.47 runs, so this difference amounts to about 0.16 runs per game. That said, there is also an important loss of double plays opportunities. That's harder to calculate, but my estimation is that this difference amounts to about 0.05 runs per game .

[Mean Dean]

[url=http://andrew-stevens.tripod.com/index/stratfield.html]Here it is in terms of OPS.[/url]

[UrbanShockers]

You are right, of course. That is, I'm not sure the model assumes that all the hitters in the lineup are the same as the subject, but the runs total it recites is per 27 AB's, so any calculation has to be divided by roughly 9. I think.

Thanks for your helpful input, both on this and on the broader question. I'll see if I can figure out what it means for my managerial decision, but I suspect the numbers are pretty close and it will be hard to be sure which is the better course.