Abstract: Using personnel data from a large U.S. retail firm, we examine whether the race or ethnicity of the hiring manager affects the racial composition of new hires. Estimating models with store fixed effects, we find significant effects of manager race and ethnicity. First, all nonblack managers—i.e., whites, Hispanics, and Asians—hire more whites and fewer blacks than do black managers. T...

background: marriage causes family and from a point of view it is a social symbol   which is reflection of whole society. one of the forms of marriage is family marriage. these kind of marriage are important in human heredity (heritage), according to social, cultural and economic conditions, this pattern of marriage is different between the countries and even inside a specific country. as famil...

Do populations grow as countries become richer? In this study we estimate the effects on population growth of shocks to national income that are plausibly exogenous and unlikely to be driven by technological change. For a panel of over 139 countries spanning the period 1960–2007, we interact changes in international oil prices with countries’ average net-export shares of oil in GDP. Controlling...

To assess the potential for enhancing an existing stand of native perennial grasses on a California Coast Range Grassland site, we experimentally manipulated the seasonal timing and presence of grazing for 3 years (1994 through 1996) and of autumn burning for 2 years (1994 and 1995) and measured species cover for 6 years (1993 through 1998). We subjected the species matrix to classification (TW...

The steps involved in viral reproduction are described briefly. Mathematical models for the growth of viral populations without random effects take the form of systems of differential equations and these are reviewed, including the standard HIV equations, with correction terms. The validity of the “mass action” assumption is questioned for low virion levels. Stochastic differential equation mod...

This article examines the multilevel linear crossed random effects growth model for estimating teacher and school effects from repeated measurements of student achievement. Results suggest that even a small degree of unmodeled nonlinearity can result in a substantial upward bias in the magnitude of the teacher effect, which raises concerns about its appropriateness for estimating teacher effect...

JEL Bibliographic Code O15, O18, O47, O53 We postulate that inferior factor productivity in China’s noncoastal provinces is a principal reason for their lower economic growth despite high investment rates relative to coastal provinces. Using the residual from a fixed-effect Solow growth model for the years 1978-93, we find that TFP is roughly twice as high in the coastal provinces. We estimate ...