Variables	$g(s[\tau ;l])=1$	$g(s[\tau ;l])=0$	Row totals
$y=\text{Cases}$	$a_{\tau ,l}$	$n_1-a_{\tau ,l}$	n1
$y=\text{Controls}$	$x_{\tau ,l}-a_{\tau ,l}$	$n_2-(x_{\tau ,l}-a_{\tau ,l})$	n2
Col. totals	$x_{\tau ,l}$	$n-x_{\tau ,l}$	n