Table 1.

An example decision table $\mathcal{D}=\left(U,,,A,\cup ,\left\{d\right\}\right)$ where $A$ is a set of two genes, $U$ is a set of five objects $x_1$, …, $x_5$ and $d$ is case or control diagnosis. The values in $U$ are discrete gene expression levels “up” or “down”

Object	${\mathit{gene}}_1$	${\mathit{gene}}_2$	$\mathit{diagnosis}$
$x_1$	Up	Up	Case
$x_2$	Up	Down	Case
$x_3$	Up	Up	Control
$x_4$	Down	Down	Control
$x_5$	Down	Up	Case