This article investigates peer relations in infancy, both in primates and in preindustrial human societies. Data from these populations shows a strong tendency toward a multi-age composition of play groups rather than solely peer-aged play groups for infants. Patterns in child care across societies of different subsistence types are empirically examined.

Different languages contain different numbers of basic colors. One interpretation is that more complex societies will have more basic color terms. Another interpretation is that peoples with less pigmented eyes will have more basic color terms. This paper suggests that both interpretations are necessary in order to predict the number of basic color terms.

This article uses logistic regression analysis to examine pathogen stress and male mortality in warfare as predictors of nonsororal polygyny. Differences between state and non-state societies are observed. The authors also retest variables from White and Burton's 1988 study on causes of polygyny, finding only fraternal interest groups and absence of plow significant.

This study analyzes several variables that influence matrilocal versus patrilocal residence. Results indicate that the traditional assumption that division of labor determines residence was not supported. Rather, results suggest that internal warfare favors partilocal residence and matrilocal residence is favored by purely external warfare if division of labor is matridominant.

This study tests the relationship between the rise of commercial exhange and the emergence of neolocal residence. Results suggest a significant correlation between these two variables.

This study investigates the role of economic development in facilitating political development in preindustrial societies, theorizing that the redistribution of resources is an important factor in this relationship. Results indicate that these two types of development have a curvilinear relationship, and the author concludes that economic development is a necessary but not sufficient cause of political development in preindustrial societies.

"This paper describes how the "sex-ratio" explanation of polygyny compares with some alternative, supposedly causal explanations. The results suggest that polygyny is best predicted by two statistically independent factors--high male mortality in warfare…and delayed age of marriage for men."

This study retests the data presented by Sillitoe (1977) in his study of the relationship between likelihood of warfare and population density in New Guinea. Contrary to Sillitoe, the author finds a strong and significant association between the two variables. The author also finds a significant relationship between the severity of food shortages and the frequency of warfare cross-culturally.

This study tests predictors of consonant-vowel prevalence cross-culturally. Authors reevaluate the findings of Munroe et. al. (1996) and also test a new variable—baby-holding—for its relationship to CV score. Results suggest that baby-holding is a significant predictor of CV score.

This study examines some of the environmental and psychological predictors of warfare frequency and interpersonal aggression. Results suggest that socialization for aggression in boys is the most significant predictor of warfare. However, authors suggest that socialization for aggression may be a consequence, rather than a cause, of war.