The sad thing is that this data must be SOMEWHERE.
Run expectancy of:
Runner on first, no outs
vs.
Runner on first, one out (after strikeout)
Runner on first, one out (after flyout, popout)
Runner on first, one out (after FC)
Runner on second, one out (after Sac or other play at first)
Runners on first and second, no outs (after error, which after all, is recorded as an out for the hitter)
Runners on second and third, no outs (after Jeter throws ball into stands)
No runners, two outs (after GIDP)
Along with the likelihood of each event.