The Fineman-Ross method can be biased towards points at low or high monomer concentration, so Kelen and Tüdős introduced an arbitrary constant,
where  and  are the highest and lowest values of  from the Fineman-Ross method. The data can be plotted in a linear form
where  and . Plotting  against  yields a straight line that gives  when  and  when . This distributes the data more symmetrically and can yield better results.