Hi everyone! I have this paragraph from an article
'We next created a scalar variable that incorporated participants’ confidence ratings into their match judgments, which we analyzed using a 2 x 2 (crime type x suspect characteristics) ANOVA. Specifically, we multiplied participants’ match judgments (coded as -1 for no match and +1 for match) by their confidence (1–10) and applied a -/+.5 correction to account for the absence of zero values.' - Smalarz, L., Madon, S., Yang, Y., Guyll, M., & Buck, S. (2016). The perfect match: Do criminal stereotypes bias forensic evidence analysis? Law and Human Behavior, 40(4), 420–429.
Can someone explain to me why it was necessary to create that new variable like that?
Thanks!
'We next created a scalar variable that incorporated participants’ confidence ratings into their match judgments, which we analyzed using a 2 x 2 (crime type x suspect characteristics) ANOVA. Specifically, we multiplied participants’ match judgments (coded as -1 for no match and +1 for match) by their confidence (1–10) and applied a -/+.5 correction to account for the absence of zero values.' - Smalarz, L., Madon, S., Yang, Y., Guyll, M., & Buck, S. (2016). The perfect match: Do criminal stereotypes bias forensic evidence analysis? Law and Human Behavior, 40(4), 420–429.
Can someone explain to me why it was necessary to create that new variable like that?
Thanks!