{"id":1439,"date":"2018-10-30T18:30:24","date_gmt":"2018-10-30T22:30:24","guid":{"rendered":"http:\/\/blog.rotovalue.com\/?p=1439"},"modified":"2018-10-30T18:30:24","modified_gmt":"2018-10-30T22:30:24","slug":"reverse-platoon-splits-before-and-after","status":"publish","type":"post","link":"https:\/\/blog.rotovalue.com\/index.php\/2018\/10\/30\/reverse-platoon-splits-before-and-after\/","title":{"rendered":"Reverse Platoon Splits – Before and After"},"content":{"rendered":"

Tom Tango asked<\/a>\u00a0someone to see what players with at least a 30-point wOBA reverse platoon split in their first 2500 plate appearances did for the rest of their careers, and Sean Foreman kindly provided<\/a>\u00a0split data from his database.
\nSo I hacked together a Perl script<\/a> to read his data and analyze it. The script lets you tweak filters, setting a minimum reverse split over some minimum number of plate appearances versus both left and right handed pitchers. Taking Tango’s suggested criteria, I found just 7 matching players, with an aggregate 40 point negative wOBA split:<\/p>\n

                             Before                                   After\n                        vs LHP     vs RHP                      vs LHP       vs RHP\nPlayer     years     wOBA    PA  wOBA   PA  Split   years    wOBA   PA    wOBA   PA  Split\nglanvdo01 1996-2000 0.313   710 0.346  2005 0.033 2001-2004 0.321   431 0.280  1136 -0.041\nbatisto01 1996-2002 0.316   872 0.351  2454 0.035 2003-2007 0.291   462 0.310  1171  0.019\nbergewa01 1930-1935 0.365   538 0.407  2101 0.041 1936-1940 0.385   289 0.370  1335 -0.015\njonesad01 2006-2012 0.316   870 0.358  2246 0.043 2013-2018 0.334  1021 0.344  2851  0.010\nsamueju01 1983-1987 0.320   840 0.351  2036 0.030 1988-1998 0.344  1556 0.310  2232 -0.034\nleeca01   1999-2003 0.329   642 0.367  2347 0.038 2004-2012 0.373  1396 0.357  4402 -0.015\njacksra01 1950-1956 0.311   599 0.359  2174 0.048 1957-1959 0.277    74 0.276   326 -0.002\nTotal               0.322  5071 0.362 15363 0.040           0.345  5229 0.336 13453 -0.009\n<\/pre>\n
Tango expected the group would be neutral, and in aggregate they showed a 9-point “normal” split in wOBA. Only two of the 7 still showed a reverse platoon split, and in both cases it was much narrower than their start of career split.
\nBut just 7 batters making his cutoff seems a little small of a sample size. So I reran, this time allowing batters with at least a 20 point wOBA reverse split, and now I get 25 players whose aggregate split is 30 points:<\/p>\n
                             Before                                   After\n                        vs LHP     vs RHP                      vs LHP       vs RHP\nPlayer     years     wOBA    PA  wOBA   PA  Split   years    wOBA   PA    wOBA   PA  Split\nglanvdo01 1996-2000 0.313   710 0.346  2005 0.033 2001-2004 0.321   431 0.280  1136 -0.041\ncasege01  1937-1945 0.313   705 0.339  2216 0.027 1946-1947 0.298   129 0.270   348 -0.028\nheganji01 1941-1952 0.286  1076 0.306  2123 0.020 1953-1960 0.291   876 0.296  1146  0.005\nbatisto01 1996-2002 0.316   872 0.351  2454 0.035 2003-2007 0.291   462 0.310  1171  0.019\nspencda01 1952-1959 0.304   662 0.326  2088 0.022 1960-1963 0.366   449 0.337   913 -0.029\nperezto01 1964-1970 0.352  1071 0.377  2261 0.026 1971-1986 0.388  2358 0.334  5166 -0.054\nbressed01 1956-1964 0.316   827 0.342  2378 0.026 1965-1967 0.308   294 0.294   574 -0.015\nmondera01 1993-1998 0.349   719 0.376  2366 0.027 1999-2005 0.383   740 0.338  2544 -0.045\nwilsopr01 1998-2003 0.343   791 0.367  2242 0.023 2004-2007 0.375   367 0.320  1036 -0.054\ndisarga01 1990-1997 0.275   846 0.299  2251 0.024 1998-2000 0.311   213 0.310   722 -0.001\njonesad01 2006-2012 0.316   870 0.358  2246 0.043 2013-2018 0.334  1021 0.344  2851  0.010\nzimmedo01 1954-1962 0.284   566 0.305  2053 0.021 1963-1965 0.294   300 0.316   674  0.022\nhemslro01 1928-1939 0.296   721 0.323  2068 0.027 1940-1947 0.322   434 0.288  1108 -0.034\ncimolgi01 1956-1963 0.307  1008 0.327  2258 0.020 1964-1965 0.141    53 0.287    23  0.146\nugglada01 2006-2009 0.340   645 0.370  2053 0.030 2010-2015 0.332   760 0.333  2051  0.001\nsuzukku01 2007-2012 0.292   780 0.321  2171 0.029 2013-2018 0.343   640 0.309  1728 -0.034\nsamueju01 1983-1987 0.320   840 0.351  2036 0.030 1988-1998 0.344  1556 0.310  2232 -0.034\nfiskca01  1969-1977 0.358   778 0.380  2047 0.021 1978-1993 0.349  2292 0.341  4736 -0.008\njacksra01 1950-1956 0.311   599 0.359  2174 0.048 1957-1959 0.277    74 0.276   326 -0.002\nbergewa01 1930-1935 0.365   538 0.407  2101 0.041 1936-1940 0.385   289 0.370  1335 -0.015\nludwiry01 2002-2011 0.328   947 0.356  2027 0.027 2012-2014 0.376   267 0.323   745 -0.053\nboonebo01 1972-1978 0.301   820 0.325  2090 0.024 1979-1990 0.293  1629 0.295  3609  0.001\nhollima01 2004-2008 0.388   660 0.415  2308 0.027 2009-2018 0.391  1309 0.373  3704 -0.018\nhornebo01 1978-1983 0.365   638 0.389  2078 0.024 1984-1988 0.392   479 0.347  1018 -0.045\nleeca01   1999-2003 0.329   642 0.367  2347 0.038 2004-2012 0.373  1396 0.357  4402 -0.015\nTotal               0.321 19331 0.352 54441 0.030           0.347 18818 0.331 45298 -0.017\n<\/pre>\n
Now we finally find a player, Don Zimmer (yes, the former Red Sox manager and Yankees coach!) who showed a greater reverse split over the rest of his career than the start, but again just barely, increasing to 22 points from 21. Just 6 other players showed any reverse split at all over the rest of their careers, and two just by a single wOBA point.
\nWhen I set the filter back at 30 wOBA points, but require fewer PA (250 against LHP, and 1000 against RHP),\u00a0 I find a total of 57 players, with this aggregate:<\/p>\n
Total               0.308 25543 0.348 67831 0.040           0.349 37399 0.331 93823 -0.018\n<\/pre>\n
Interestingly, this group in aggregate shows an 18-point normal platoon split over the rest of their careers, after a 40 point reverse split from the start of their careers.
\nSo overall, it seems that even players who show a pronounced reverse platoon split tend to show a more normal platoon split over the rest of their careers.
\nIf you want to tinker with different filters, you can download the raw data Sean Foreman made available<\/a>, and pass it to my Perl script<\/a> with different arguments.<\/p>\n","protected":false},"excerpt":{"rendered":"
Tom Tango asked\u00a0someone to see what players with at least a 30-point wOBA reverse platoon split in their first 2500 plate appearances did for the rest of their careers, and Sean Foreman kindly provided\u00a0split data from his database. So I hacked together a Perl script to read his data and analyze it. The script lets… Continue reading Reverse Platoon Splits – Before and After<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[6,14],"tags":[],"_links":{"self":[{"href":"https:\/\/blog.rotovalue.com\/index.php\/wp-json\/wp\/v2\/posts\/1439"}],"collection":[{"href":"https:\/\/blog.rotovalue.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.rotovalue.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.rotovalue.com\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.rotovalue.com\/index.php\/wp-json\/wp\/v2\/comments?post=1439"}],"version-history":[{"count":0,"href":"https:\/\/blog.rotovalue.com\/index.php\/wp-json\/wp\/v2\/posts\/1439\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.rotovalue.com\/index.php\/wp-json\/wp\/v2\/media?parent=1439"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.rotovalue.com\/index.php\/wp-json\/wp\/v2\/categories?post=1439"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.rotovalue.com\/index.php\/wp-json\/wp\/v2\/tags?post=1439"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}