# 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.)