I looked at the Baseball Reference Play Index's log of plate appearances and double plays from 1970 to 2006 to get the data; the B-R PI itself culls information from Retrosheet.
To recap, the opportune situations for double plays are:
0 Out, 1--
0 Out, 12-
0 Out, 1-3
0 Out, 123
1 Out, 1--
1 Out, 12-
1 Out, 1-3
1 Out, 123
Between 1970 and 2006, batters came up a staggering 1,129,812 times in those eight situations combined. A double play resulted 137,745 times, or at a 12.2% rate. Last Monday I noted that from 1997-2006 the rate was 12.0%; it would seem that's pretty close to standard. To wit, a chart:
(click to enlarge)
That chart shows the overall double play rate from 1970-2006, along with the rates of 0 out and 1 out situations. It looks pretty constant, though slightly elevated in the early 1980's. The overall rate is closer to the 1 out rate and with good reason: there were 657, 387 PA in those situations with 1 out compared to 473, 172 with nobody out. For the curious, the DP rate across all years with 0 out was 11.2% (52766/473172) while the rate with 1 out was 12.9% (85064/657387).
Before I get to three very hard to read charts, let's look at some relevant numbers in table form:
Outs: | 0 Out | 1 Out | Total | ||||||
---|---|---|---|---|---|---|---|---|---|
Bases Filled: | PA | DP | Rate | PA | DP | Rate | PA | DP | Rate |
1-- | 335006 | 37946 | 11.3% | 381111 | 48145 | 12.6% | 716117 | 86091 | 12.0% |
12- | 82937 | 8815 | 10.6% | 151064 | 19680 | 13.0% | 234001 | 28495 | 12.2% |
1-3 | 33575 | 3556 | 10.6% | 69480 | 9280 | 13.4% | 103055 | 12836 | 12.5% |
123 | 21654 | 2449 | 11.3% | 54985 | 7874 | 14.3% | 76639 | 10323 | 13.5% |
Total | 473172 | 52766 | 11.2% | 656640 | 84979 | 12.9% | 1129812 | 137745 | 12.2% |
Alright, with that in mind, here's three hard-to-read charts of each situation year-by-year. The order is Overall situations, 0 out situations, 1 out situations.
Finally, here's easier-to-read charts of each situation on the bases with DP rates for 0 out, 1 out, and both combined. Note 1977 on the Bases Loaded chart; that is the only time the 0 out DP rate ever exceeded the 1 out DP rate in any situation. The order of the charts is 1--, 12-, 1-3, 123.
I hope this wasn't too tedious.
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