“…Used in combination with SOC-IS, it has proven very useful in studies analyzing children's behavior in the classroom (Anguera, Espinosa, & Santoyo, 2002;Anguera, Santoyo, & Espinosa, 2003;Espinosa, Anguera, & Santoyo, 2004) and in other observational studies (Hernández-Mendo & Anguera, 1998;Anguera & Losada, 1999;Aragón, Lapresa, Arana, Anguera & Garzón, 2017;Castañer et al, 2016;Gorospe & Anguera, 2000;Herrero, 2000;López, Valero, Anguera & Díaz, 2016;Morillo, Reigal & Hernández-Mendo, 2015;Perea, Castellano, Alday & Hernández-Mendo, 2012). We believe that polar coordinate analysis would also be a valuable tool for analyzing the impact of self-regulation interventions in children with high rates of behavior transitions (Norris, 2016;Slattery, et al, 2016). Following Cochran's proposal (1954), the prospective adjusted residuals (positive lags) and retrospective adjusted residuals (negative lags) generated in the lag sequential analysis were used, respectively, to compute prospective and retrospective Z sum values, which in turn were used to calculate vector length and angle.…”