Change Date:
AMERICAN

   10-10    10-11    10-12    10-13    10-14    10-15    10-16    10-17    10-18  YTDPCT
Anaheim
na
na
na
na
na
na
na
na
na
+2.420.494
Baltimore
na
na
na
na
na
na
na
na
na
+3.460.290
Boston
na
+3.98
na
-6.28-4.12
na
+1.48+0.99+2.31-3.900.671
Chicago
na
na
na
na
na
na
na
na
na
-1.370.383
Cleveland
na
na
na
na
na
na
na
na
na
+1.580.551
Detroit
na
na
na
na
na
na
na
na
na
+2.210.395
Houston
na
na
na
-10.69-6.74
na
+0.25+0.35+2.06-3.760.633
Kansas City
na
na
na
na
na
na
na
na
na
+0.330.358
Minnesota
na
na
na
na
na
na
na
na
na
-5.140.481
New York
na
+3.80
na
na
na
na
na
na
na
-7.260.611
Oakland
na
na
na
na
na
na
na
na
na
+2.560.595
Seattle
na
na
na
na
na
na
na
na
na
-12.960.549
Tampa Bay
na
na
na
na
na
na
na
na
na
-0.570.556
Texas
na
na
na
na
na
na
na
na
na
-5.060.414
Toronto
na
na
na
na
na
na
na
na
na
+0.300.451

 

NATIONAL

   10-10    10-11    10-12    10-13    10-14    10-15    10-16    10-17    10-18  YTDPCT
Arizona
na
na
na
na
na
na
na
na
na
-3.640.506
Atlanta
-3.38
na
na
na
na
na
na
na
na
-4.540.548
Chicago
na
na
na
na
na
na
na
na
na
-10.970.579
Cincinnati
na
na
na
na
na
na
na
na
na
-1.820.414
Colorado
na
na
na
na
na
na
na
na
na
+21.720.551
Miami
na
na
na
na
na
na
na
na
na
-4.210.391
Los Angeles
-3.85
na
-1.67-0.68
na
-0.75-1.30+1.46
na
+1.880.570
Milwaukee
na
na
-9.33-5.91
na
-3.27-3.15+0.54
na
-0.270.591
New York
na
na
na
na
na
na
na
na
na
+0.120.475
Philadelphia
na
na
na
na
na
na
na
na
na
+1.160.494
Pittsburgh
na
na
na
na
na
na
na
na
na
-0.900.509
San Diego
na
na
na
na
na
na
na
na
na
-21.720.407
San Francisco
na
na
na
na
na
na
na
na
na
-0.920.451
St. Louis
na
na
na
na
na
na
na
na
na
+0.290.543
Washington
na
na
na
na
na
na
na
na
na
+21.350.506


How to use VMI


Today's VMI's    (Draft with WAR....Manage with VMI)

VMI informationAs the teams travel from one baseball venue to another, the first game of the series will be the highest index.  As the two teams play through the series, the index for each team will subside.  When the two teams have a similar index, the games will be less affected by air resistance adjustments and therefore tend to be quite competitive.  The lowest index for each team in the series will be the last game of that series, with one exception.  If a cold weather system or a high pressure system hits during a series, it can change the index for both teams and affect the performance either for better or for worse.   Most of the time, the weather forecast is sufficient to anticipate such a change, however periodically a system will catch everyone off guard, including the VMI's for the day. 

Keep this in mind:

Indices in the PLUS ranges is good - between 7.00 and 15.00 is best, because the most used pitch (the 4-seamer) is lifting and tailing between 1 and 2 inches less than the team is used to seeing; and all the other pitches are moving less, as well. 

Index at ZERO is good in that air resistance issues are negated by the players' recent exposure to similar movement.  At ZERO, and small plus (+) indices, focus is a much larger issue than is ball movement.  These small plus indices indicate the ball is going to move about the same as in several previous games for this team's hitters.  This is where focus is more difficult to maintain.   Small minuses (-) tend to indicate that with the ball moving slightly more than previous games, the player will be more likely to keep his focus.

Index in the larger MINUS ranges indicates adjustment is more difficult for hitters - between -7.00 and -15.00 is toughest.   Pitchers make fewer mistakes when pitching to hitters adjusting from this index range, because all their pitches are more effective.  Above minus 15 (-15), pitchers depending on opponents previous days' performance, in lieu of understanding the air, can lead to mistakes, especially on the first game of a new series.

Y-T-D Index

We have added the Year To Date index so that you can keep track of which team has been advantaged more and which has been disadvantaged more over the course of the year.  In some cases, the severity of the index indicates that a team has been advantaged by extremely hot weather or an extremely cold period which the other teams may have missed.  The result at the end of the year indicates the net amount advantaged (+) or disadvantaged (-) games played.   We have moved the decimal two places to the right, so that the comparison will be more meaningful as the season progresses.