I'm sure we've all noticed that the Cubs are having a ridiculous amount of trouble scoring baserunners, but how bad is it really? It's often the case that fans overstate their own team's problems: they're more familiar with them than they are with other teams', for a start. In this case, though, the Cub Nation is entirely justified in its despondency.
This list shows the percentage of baserunners who end up scoring. Everything else is factored out: how runners get on base, which base they get to when they do, how many outs there are when they do it. All that's counted are these two things:
Baserunners: hits - HR + walks + HBP + reached on error + catcher interference. Home runs are discounted because they don't result in a baserunner. Weird fact: 3 players have reached base on catcher's interference so far this season, and all of them are Diamondbacks
Runners scored: Runs - HR. Again, Home runs are discounted because the hitter was never a baserunner. Any other runners scored on a home run are counted, though.
Run-scoring efficiency is simply Runners scored / Baserunners, expressed as a percentage
Team Baserunners Scored Efficiency STL 244 92 37.7% NYM 244 86 35.2% COL 286 92 32.2% SFG 263 82 31.2% MIL 228 68 29.8% CIN 3O3 9O 29.7% ARI 273 8O 29.3% PIT 245 68 27.8% PHI 247 67 27.1% WSN 222 59 26.6% ATL 241 61 25.3% SDP 237 59 24.9% LAD 268 6O 22.4% MIA 233 52 22.3% CHC 2O9 45 21.5%
Given the closeness of the Cubs' games so far, it seems clear that anything even remotely like a league-average performance would have resulted in several more wins. In fact, if 28.3% of Cub baserunners had scored - that's the average - they'd have 14 more runs, which would probably make their record so far look a lot rosier than it does now.