Correction to: Woo and Sohn Financial Innovation 2022, 8(1):42 https://doi.org/10.1186/s40854-022-00347-4

Following publication of the original article (Woo and Sohn 2022), the authors identified a typesetting error whereby the incorrect Fig. 1 was published in the HTML version of the article. Figure 1 in the PDF version of the original article is correct. The publishers apologize for this error.

Further to this, it was reported that a comma was missing in Eq. (2). The corrected Eq. (2) is given below:

$$Sim_{j} [s_{1} ,s_{2} ] = \left\{ {\begin{array}{*{20}l} {0,} \hfill & {m = 0} \hfill \\ {\frac{1}{3}\left\{ {m\left( {\frac{1}{{|s_{1} |}} + \frac{1}{{|s_{2} |}}} \right) + \frac{m - t}{m}} \right\},} \hfill & {m > 0} \hfill \\ \end{array} } \right.$$

The original article has been updated.