Multilevel modeling analysis of dyadic network data with an application to Ye'kwana food sharing

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

Scintigraphic Diagnosis of Meckel's Diverticulum

Adiseshan, N. and Neely, M. G. (1976). Aust. paediat. J., 12, 322–325. Scintigraphic diagnosis of Meckel's diverticulum. Tc‐pertechnetate abdominal scintigraphy, employing a standardised procedure, was used in a group of 15 patients clinically suspected of having Meckel's diverticula and in a control group of 15 patients. Four patients with scintigraphic evidence of Meckel's diverticulum had the lesion at laparotomy. The scintigraphic procedure proved simple and reliable. The possible limitations are discussed. Copyrigh