Climate warming causes declines in crop yields and lowers school attendance rates in Central Africa.

Although a number of recent studies suggest that climate associated shifts in agriculture are affecting social and economic systems, there have been relatively few studies of these effects in Africa. Such studies would be particularly useful in Central Africa, where the impacts of climate warming are predicted to be high but coincide with an area with low adaptive capacity. Focusing on plantain (Musa paradisiaca), we assess whether recent climate change has led to reduced yields. Analysis of annual temperature between 1950 and 2013 indicated a 0.8°C temperature increase over this 63-year period - a trend that is also observed in monthly temperatures in the last twenty years. From 1991 to 2011, there was a 43% decrease in plantain productivity in Central Africa, which was explained by shifts in temperature (R2=0.68). This decline may have reduced rural household wealth and decreased parental investment in education. Over the past two decades, there was a six month decrease in the duration of school attendance, and the decline was tightly linked to plantain yield (R2=0.82). By 2080, mean annual temperature is expected to increase at least 2°C in Central Africa, and our models predict a concomitant decrease of 39% in plantain yields and 51% in education outcomes, relative to the 1991 baseline. These predictions should be seen as a call-to-action for policy interventions such as farmer training programs to enhance the adaptive capacity of food production systems to mitigate impacts on rural income and education.

An item factor analysis and item response theory-based revision of the Everyday Discrimination Scale.

The Everyday Discrimination Scale (EDS), a widely used measure of daily perceived discrimination, is purported to be unidimensional, to function well among African Americans, and to have adequate construct validity. Two separate studies and data sources were used to examine and cross-validate the psychometric properties of the EDS. In Study 1, an exploratory factor analysis was conducted on a sample of African American law students (N = 589), providing strong evidence of local dependence, or nuisance multidimensionality within the EDS. In Study 2, a separate nationally representative community sample (N = 3,527) was used to model the identified local dependence in an item factor analysis (i.e., bifactor model). Next, item response theory (IRT) calibrations were conducted to obtain item parameters. A five-item, revised-EDS was then tested for gender differential item functioning (in an IRT framework). Based on these analyses, a summed score to IRT-scaled score translation table is provided for the revised-EDS. Our results indicate that the revised-EDS is unidimensional, with minimal differential item functioning, and retains predictive validity consistent with the original scale.

It matters how and when you ask: self-reported race/ethnicity of incoming law students.

The high-stakes nature of law school testing and admissions puts a premium on the student data presented to admissions committees, such as essays, academic and work history, and student background characteristics including race/ethnicity. 4,472 law school-bound students self-identified their race/ethnicity using (a) a mutually exclusive "choose one" format during registration for the law school admissions test, and (b) an elaborated "check-all-that-apply" format as part of a national survey administered during the first weeks at their chosen law school. Student multiraciality that was masked by the first assessment was associated with self-reported ethnic identity, discrimination experience, intergroup contact, race-related attitudes, academic performance, and trait ratings, as compared to monoracial majority students. A different profile of findings was observed across these constructs when multiracial students were compared to monoracial majority students, to monoracial minority students, and within group. These correlates also predicted the likelihood of changing identification across the two assessment contexts. These findings support the continued study of specific combinations of multiracial groups, fluidity of multiracial identities, and context effects that influence race/ethnicity self-categorizations.