Based on the social cognitive theory and the emotional contagion theory, this study investigated if friends influence (reinforce or change) the development of academic values (intrinsic value, emotional cost) and if this process differs across same-sex friendship dyads. We drew on data collected in a two-wave longitudinal study in Germany. The final sample was based on 264 stable reciprocated friendship dyads of grades 5 and 7 (148 female dyads and 116 male dyads). Results of actor-partner-interdependence models indicated that friends reinforce each other regarding the intrinsic value and initiate change regarding the emotional cost. Moreover, female and male friendship dyads did not differ in the strength of influence on academic values. Results were discussed in terms of selection and socialization effects regarding friendships.

中文翻译：

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朋友对数学学术价值观发展的影响：男女二人有区别吗？

本研究基于社会认知理论和情绪传染理论，调查朋友是否影响（加强或改变）学术价值观（内在价值、情感成本）的发展，以及这一过程是否在同性友谊二人组中有所不同。我们利用在德国进行的两波纵向研究中收集的数据。最终样本基于 264 个稳定的 5 年级和 7 年级的互惠友谊对偶（148 对女性和 116 对男性）。演员-伴侣-相互依赖模型的结果表明，朋友在内在价值方面相互加强，并在情感成本方面引发变化。此外，男女友谊二人组对学术价值观的影响强度没有差异。结果在关于友谊的选择和社会化影响方面进行了讨论。