How many hits does it take to score a run?

Short answer: 2

There are many ways of deriving this.  You can get the total hits and total runs by adding all player stats together or all team stats together.  You can add up all game line scores together too.  Having the event data I chose to just add up hits and runs from the event entities.  To run a longitudinal study like this requires calculating each season separately then adding up the results.  I chose to gather data from 1980 to present.   With this deep of a data set the number of hits per run is exactly 2 and that number doesn’t vary much at all from season to season.  This number can be considered a constant.

TOTAL 1317126 671115 2.0
1980 38004 18054 2.1
1981 24059 11147 2.2
1982 37437 18111 2.1
1983 37363 18170 2.1
1984 37251 17922 2.1
1985 36389 18216 2.0
1986 36751 18545 2.0
1987 37802 19882 1.9
1988 36208 17378 2.1
1989 36283 17403 2.1
1990 36811 17919 2.1
1991 36089 18128 2.0
1992 36048 17341 2.1
1993 41074 20862 2.0
1994 29731 15751 1.9
1995 36968 19554 1.9
1996 42316 22832 1.9
1997 41465 21602 1.9
1998 44488 23296 1.9
1999 45326 24690 1.8
2000 45244 24969 1.8
2001 43876 23199 1.9
2002 43267 22408 1.9
2003 44039 22978 1.9
2004 44511 23376 1.9
2005 43975 22325 2.0
2006 45062 23599 1.9
2007 44960 23322 1.9
2008 43963 22585 1.9
2009 43511 22419 1.9
2010 42545 21308 2.0
2011 42257 20808 2.0
2012 42053 21016 2.0