# Users versus models: What observation tells us about effectiveness
metrics

Moffat, Thomas, Scholer, CIKM 2013

## Errata

There is a mistake in Equation 6 on page 3, describing
${C}_{\mathrm{AP}}$; the subexpression
$\frac{{r}_{i}}{i}$
inside the summations should actually be
$\frac{{r}_{j}}{j}$
, in all three places where that subexpression occurs. (Thanks to
Ziying Alicia Yang for spotting this.)