whereN is the number of tokens in the page.
This can be done simply by scanning the possible values for i and j and computing the objective function.
Note that this procedure will only work when the proportion of text tokens in the noncontent section is lower than the proportion of tags,
which is not the case for the web page in Figure 3.17.
Pinto et al. (2002) modified this approach to use a text window to search for low-slope sections of the document slope curve.