X

Independent variable

Y = Dependent or predicted variable

∑_rows

1 = case

0 = non-case

1 = exposed

n_11i= a_i

n_10i = b_i

n_1•i= n_1i

0 = no expoxed

n_01i = c_i

n_00i= d_i

n_0•i = n_0i

∑_columns

n_•1i = m_1i

n_•0i = m_0i

n_••i = T_i