Let the mixed linear regression model when mean value parameters satisfy some linear constraints be under consideration. To detect rough errors or mistakes (outliers) in observations needs a knowledge of a covariance matrix of an observation vector. If unknown variance components occur in it, some problems arise how to recognize, whether estimates or approximations of them can be used instead o...

The aim of this study was to evaluate the effect of prenatal exposure to lead, cadmium and mercury levels on the secondary sex ratio. Whole blood samples were collected from pregnant women enrolled in the Avon Longitudinal Study of Parents and Children (ALSPAC) study at a median gestational age of 11 weeks and were analyzed for lead, cadmium and mercury. Regression analysis was used to identify...

OBJECTIVE To investigate the prospective associations between dietary patterns in childhood and CVD risk in adolescence. DESIGN Prospective cohort study. Exposures were dietary patterns at age 7, 10 and 13 years derived by cluster analysis. Outcomes were physiological and biochemical cardiovascular risk markers. SETTING Avon Longitudinal Study of Parents and Children (ALSPAC), UK. SUBJECT...

This study uses the unique design of the Gautreaux residential mobility program to estimate the long-run impacts of placement neighborhood conditions on the AFDC receipt (N = 793) and employment levels (N = 1258) of low-income Black women. We find that women initially placed in neighborhoods with few Black residents and moderate to high neighborhood resources experienced significantly more time...

This article considers a linear regression model when a set of exact linear restrictions binding the coeecients is available and some observations on the study variable are missing. Estimators for the vectors of regression coeecients are presented and their superiority properties with respect to the criteria of the variance covariance matrix and the risk under balanced loss functions are analyzed.

BACKGROUND The remarkable socioeconomic changes in United Arab Emirates (UAE) necessitate regular monitoring of obesity in our population. This study explored the epidemiology of obesity in a large cohort of UAE students. METHODS This population-based study investigated the prevalence of obesity in 44,942 students attending governmental schools in Ras Al-Khaimah. Body-mass-index (BMI) was cal...

Little is known about the incidence and cost of injuries for Medicaid children. This article provides data on hospital utilization and payments for injuries among Medicaid children, using the Health Care Financing Administration's (HCFA) State Medicaid Research Files. During 1992, there were nearly 17,000 injury hospitalizations for California's Medicaid children (758 per 100,000 enrollees), re...