The columns "XVAL" and "ZVAL" represent
value-based drafting statistics,
which allow you to compare the relative value of players across
positions.
XVAL
This figure represents the player's point total, subtracted by the
total of the first _non-roster_ player at that position. A roster
of 2 QB, 4 RB, 5 WR, 2 TE and 2 K is assumed, for a 12-team league.
(For the page in which WR and TE are combined, the assumed roster
size is still 5 WR). Using non-roster players instead of non-starters
more closely approximates the cost of replacing a particular player's
value.
ZVAL
This column uses a slightly different and more thorough formula.
The player's total is divided by the baseline, then multiplied by
the percentile rank. For instance, Ricky Williams' total is approximately
6.33 times the production of the first RB not to be "drafted. "
This percentage of the mean (630%) is multiplied by the percentile
score (1.00, since his total is the best among RBs).
The ZVAL accounts for both distance from the mean and proximity
to the maximum, since the goal of fantasy drafting is to draft not
only those players who score the highest, but who do so with the
most acuity relative to their position.
The combined WR/TE ZVALs are computed using all qualifying receivers;
the overall ZVAL rankings reflect calculations based on separate
categories for WR and TE.
The overall list is not a draft order; but it does reflect the league-wide
value of the player's production, compared to the other choices
you have at that position. Players should ideally be drafted right
before someone else might do so; making the second overall ZVAL
player the 2nd pick of the draft is not necessarily the right strategy.
Also note that value calculations are somewhat less precise for
TD-only leagues, due to the smaller variation in score increments
and totals. But it effectively applies scarcity as a tool for evaluating
players across position.
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