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”