Scalar population models, commonly referred to as count-based models, are based on time-seriesdata of population sizes and may be useful for screening-level ecological risk assessments when data formore complex models are not available. Appropriate use of such models for management purposes,...

This paper uses Nevada data to conduct regression analyses of the relationship between sage grouse (Centrocercus urophasianus) population sizes and potential causal factors. This is policy-relevant because of current petitions for listing this species under the Endangered Species Act. A key...