Dig Percentage & Efficiency Change

Dig Percentage is something that comes up as a way to measure defensive efficiency. You might look at two similar passers and see which one of them shanks digs at a lower rate as a means of evaluation. As we can see from the viz above, Wilhite, JWO, Albrecht, and Maloney (3 of whom play... Continue Reading →

Blocking Responsibilities – Big Ten

One of the things people have never been able to look at in DataVolley is the way to examine blocker responsibilities. The reason this is an issue is that if you don't have a block contact coded in DataVolley, nobody knows that you were at the net when the attack happened. The goal of uncovering the... Continue Reading →

Intro to Efficiency Change

*if you haven't, go read Output Eff first or you'll be lost. Here are the same two rallies we've been looking at for Output and Input Eff. The only difference is that we've calculated Eff Change via (Output Eff - Input Eff). The idea here is to look at the situation you were dealt and the result... Continue Reading →

Input Win Efficiency

*if you haven't, go read Output Eff first or you'll be lost. Here is the other half of the puzzle. Input Efficiency. Input Eff works the same way as Output Eff except we look at the previous contact to determine the situation you were dealt. The idea here is that attacking after a poor pass... Continue Reading →

Output Win Efficiency

Here is the extension of the FBSO eff post - but applied to all types of touches. For every contact, we find the resulting Win Efficiency. So for Skjodt's R+ contacts, Michigan's FBSO eff here is around .300.  Naturally this flips for Bates' S- where -0.300 is Wisconsin's "Point Score" efficiency on that reception to attack... Continue Reading →

Service Error and FBSO

As a follow-up, here is a more advanced way to evaluate serving. FBSO is of course indicative of your opponent's ability to win the point on the opening possession - but what many overlook is losing on the opening possession. What you see graphed along the y-axis is "FBSO efficiency", meaning we subtract lost points on the 1st... Continue Reading →

Service Error and Passer Ratings

How aggressively do we want to serve? Tough, but not too aggressive? Keep it in and make your opponent work? Screw it and let it rip? Probably somewhere in the middle...? Serve tough until enough parents in the audience complain?? (Side note, listen to Becks talk serving if you never have) The first step coaches usually take... Continue Reading →

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