Small subscript missing in equation 2.22 In the digital edition (maybe printed also) we have: lhd = Π<sup>n</sup><sub>i=1</sub> p(y<sub>i</sub> | **x**<sub>i</sub>) =Π<sup>n</sup><sub>i=1</sub> _p_<sub>i</sub><sup>yi</sup>(1-_p_<sub>i</sub>)<sup>1-y<sub>i</sub></sup> should be: lhd = Π<sup>n</sup><sub>i=1</sub> p(y<sub>i</sub> | **x**<sub>i</sub>) =Π<sup>n</sup><sub>i=1</sub> _p_<sub>i</sub><sup>y<sub>i</sub></sup>(1-_p_<sub>i</sub>)<sup>1-y<sub>i</sub></sup> Note the added subscript at _p_<sub>i</sub><sup>y<sub>i</sub></sup> instead of _p_<sub>i</sub><sup>yi</sup>