This article presents the results of a new method of ordinal scaling that the author proposes is an ordinal analogue of multidimensional curvilinear factor analysis. The method identifies traits that reach a maximum level of development and then decline (D-type) and traits that do not decline after reaching a maximum (P-type). Male-dominant and equidominant/female-dominant societies are analyzed separately. Several cultural traits are examined.

This book examines population growth rate and its correlates by testing 274 hypotheses (derived from multiple theories) with an 18-society sample. Forty-one of these hypotheses were significant at the .05 level, leading the author to accept these relationships as reflective of the real world. The 274 hypotheses are grouped into 51 broader hypotheses, and marked by (*) where relationships are significant as designated by the author or by significance p < 0.05.

This paper asks if meteorological data can help predict instances of drought and flood in the ethnographic record, with the goal of being able to use such data to more easily evaluate the effect of climate/weather on cultural beliefs, practices, and attitudes. The authors develop several indices of droughts, floods, and extreme weather and test them by applying data from weather stations in close proximity to SCCS societies and comparing the predictions to ethnographic accounts of natural hazards. Weather data included daily precipitation, minimum temperature, and maximum temperature dating back as far as the 1950s. The authors found that precipitation - evaporation (P-E) measures and Palmer Drought Severity Index (PDSI) overpredicted droughts, whereas a combined drought measure underpredicted droughts, and that the flood indices generally were not very useful in predicting flood events. The authors suggest using P-E measures and PDSI to hindcast the presence of droughts, and the combined drought measure to hindcast the absence of droughts. They suggest that the overprediction of both floods and droughts is a result of extreme weather not necessarily having a severe impact on crop yields.

Economic growth has often been viewed as a pathway to improving human wellbeing, yet increases in wealth have not consistently translated into greater emotional wellbeing. This study examines the hypothesis that populations with greater ancestral ties to hunter-gatherer societies will report higher levels of wellbeing. To test this hypothesis, the author constructed a country-level measure of gatherer ancestry using data from 1,265 small-scale societies in the Murdock Ethnographic Atlas and compared it with national measures of happiness and life satisfaction from the World Values Survey across 104 countries between 1981 and 2014. Regression analyses controlling for income per capita and a broad range of historical and contemporary covariates found that gatherer ancestry was a significant positive predictor of happiness (β = 13.58, SE = 3.00, p < .01; model R² = 11.8%). These findings remained robust across multiple models, suggesting that characteristics associated with hunter-gatherer lifeways may provide important insights into the social and ecological conditions that promote human emotional wellbeing.

The author explicitly defines and provides code for male and female age organizations and secret societies in Africa, as well as their significant sociopolitical roles within society. The author conducts preliminary analysis using the codes to explore characteristics and regional patterns of such organizations and societies. The analysis is compared to existing studies in order to assess the code and better understand cross-cultural patterns and variances. The author identifies the usefulness of the code beyond Africa, and discusses avenues for future research. No explicit hypotheses were tested, but Ericksen includes some descriptive generalizations.

This article presents evidence suggesting that sex differences in aggression are universal, but that the differences are also highly susceptible to experiential modification. Following a “phylogenetic perspective” that emphasizes the interaction of genotype and experience, the author finds that boys are on average more aggressive than girls but adult males as a group are not significantly more aggressive than women.

"The kin selection hypothesis posits that male androphilia evolved because androphilic males invest more in kin, thereby enhancing inclusive fitness." However, increased kin-directed altruism has only been seen in societies that exhibit transgendered male androphilia. To test the validity of the kin selection hypothesis for male androphilia, the authors examine the relationship between ancestral sociocultural conditions, access to kin, and societal reactions to homosexuality and the expression of male androphilia as transgendered or non-transgendered. They find that ancestral sociocultural conditions and bilateral and double descent systems were more common in transgendered than non-transgendered societies.

Heider's theory of cognitive balance is applied to Levi-Strauss' discussion of the sentiment relations existing among four kin roles.

This article suggests that Spiro's (1965) study on typology of social structure used a biased cross-cultural sample and possibly obscured regional patterns in data. Hypotheses related to marital structure, descent rules, food production and social stratification are tested.

In this chapter of 'Beyond War,' Douglas critiques previous codes of warfare to make a distinction between feuding and warring. A test of warfare and level of social complexity among hunter-gatherers is conducted. Results indicate that complex hunter-gatherers make war while a majority of simple hunter-gatherers do not.