! Missing $ inserted.
<inserted text>
$
l.121 \^{p_{ijk}}
= \^{\pi}_{ijk} = \fract{y_{ijk}}{n}
! Missing $ inserted.
<inserted text>
$
l.121 \^{p_{ijk}}
= \^{\pi}_{ijk} = \fract{y_{ijk}}{n}