[en] The relationship between young people and friends behaviors has been widely studied. In the case of externalizing behaviors in young people, the processes involved in the influence of peers are described in terms of the perceived behavior of friends. However, there is a bias between the perception of the behavior of peers and the self-reported and it has been seen that young people can overestimate the criminal/antisocial behavior of their friends. Therefore, the objective of this study was to study the relationship of the antinormative conduct of friends and the perception of this behavior informed by the best friend as a source of reliability interjudges; in addition to other externalizing behaviors of their own, such as drug use and antisocial behavior, such as convergent validity. A sample (N = 765, M = 14.53, SD = 1.44) of a more extensive longitudinal study (50.52 % girls) completed questionnaires (DIS, SENA and DPS). From this sample, we selected the cases of the participants who had nominated their best friend and who, in turn, had also answered the questionnaires (N = 350, 53.14 % girls, M = 14.32, DT = 1.35). The results of the Pearson Bivariate Correlation showed that the results of the DPS were associated with the antinormative behaviors of the peer group (r = 0.49), the frequency of alcohol consumption (r = 0.21) and tobacco (r = 0.26 ) and externalizing behaviors (antisocial behavior = 0.61) reported by the best friend. Finally, the scale on Friends' Antinormative Behaviors seems to have moderate interjudge reliability and convergent validity indexes. Therefore, the perception of the behavior of the friends and the one they actually report are moderately different.

[es] La relación entre la conducta de los jóvenes y sus amigos ha sido ampliamente estudiada. En el caso de las conductas externalizantes, se describen los procesos implicados en la influencia de los iguales en función de la conducta percibida de los amigos. No obstante, existe un sesgo entre la percepción de la conducta de los iguales y la autoinformada. Se ha visto que los jóvenes pueden sobreestimar la conducta delictiva/antisocial de sus amigos.! Por ello, el objetivo del presente trabajo es estudiar la relación de la conducta antinormativa de los amigos y la percepción de esta conducta informada por el mejor amigo como fuente de fiabilidad interjueces, además de otras conductas externalizantes propias, tales como el consumo de drogas y la conducta antisocial, como validez convergente.! Una muestra de jóvenes participantes (N = 766; M = 14,53; DT = 1,44) de un estudio longitudinal más extenso (50,52 % chicas) completaron cuestionarios sobre la conducta y consumo sustancias propio y de sus amigos (DIS, SENA y DPS). De esta, se seleccionaron una submuestra los casos de pares de amigos nominados como mejores amigos (N = 350; 53,14 % chicas; M = 14,32; DT = 1,35).! Los resultados de la correlación bivariada de Pearson mostraron que los resultados del DPS se asociaban con las conductas antinormativas del grupo de pares (r = 0,49), la frecuencia de consumo de alcohol (r = 0,21) y tabaco (r = 0,26) y las conductas externalizantes (r conducta antisocial = 0,61) informadas por el mejor amigo.! Finalmente, la escala sobre las conductas antinormativas de los amigos parece poseer índices moderados de fiabilidad interjueces y de validez convergente.