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Behavioral ecologists have recently begun using multilevel modeling for the analysis of social behavior. We present a multilevel modeling formulation of the Social Relations Model that is well suited for the analysis of dyadic network data. This model, which we adapt for count data and small datasets, can be fitted using standard multilevel modeling software packages. We illustrate this model with an analysis of meal sharing among Ye'kwana horticulturalists in Venezuela. In this setting, meal sharing among households is predicted by an association index, which reflects the amount of time that members of the households are interacting. This result replicates recent findings that interhousehold food sharing is especially prevalent among households that interact and cooperate in multiple ways. We discuss opportunities for human behavioral ecologists to expand their focus to the multiple currencies and cooperative behaviors that characterize interpersonal relationships in preindustrial societies. We discuss possible extensions to this statistical modeling approach and applications to research by human behavioral ecologists and primatologists. Am J Phys Anthropol 157:507–512, 2015. © 2015 Wiley Periodicals, Inc.

This study investigates the nature of collaboration on wikis as opposed tothe nature of collaboration resulting in a paper composition. In order tounderstand this phenomenon students were placed in groups of four andasked to write two essays during the semester. On one essay students wereasked to produce a composition in the target language on a wiki. Onanother they were asked to produce a composition that would be given tothe teacher in hard copy. Specific research questions includeddetermining to what extent students prefer collaborating to produce a wikior paper composition. Additionally, we attempted to determine, accordingto students, what the advantages and disadvantages of collaborating on awiki composition versus a paper composition are and what effect theseadvantages and disadvantages might have on collaboration. Data wascollected from over one hundred university students through likert-scaletype questions, open-ended written questions as well as face to faceinterviews. Findings indicate that the collaborative process on the wikireflected true collaboration where students had a hand in each part of thecomposition. On the other hand, while completing the paper composition,students generally handed their assigned portion to a single student in thegroup who was designated the compiler and would rarely see or commenton the other group members’ work. The authors also provide a discussionof specific advantages and disadvantages of wiki and paper-basedcompositions and important implications for practitioners.