This paper provides a set of empirical tests of the cross-sectional variation of stock volatility and investablility, where investability is defined as the degree to which a stock is accessible to foreigners. Unlike previous studies, which focus on market volatility and market return, we study the relationship between individual stock return volatility and its investablility. Our findings have ...

OBJECTIVES Diagnostic patterns play a role in asthma prevalence estimates and could have implications for disease management. We sought to determine the extent to which questionnaire-derived estimates of childhood asthma reflect the disease's true occurrence. MATERIALS AND METHODS Children aged 6-12 years from Katowice, Poland, were recruited from a cross-sectional survey (N = 1822) via prima...

Differences between boys and girls in anatomic structural features and dynamic movement patterns increase during childhood. We studied anatomic structural properties and dynamic characteristics in a cross-sectional sample of 27 girls and 27 boys ranging from 4 to 16 years of age. The subjects walked and were filmed to create digitized 3-D-point-light models. Linear discriminant functions based ...

STUDY OBJECTIVES Serum KL-6 (Krebs von den Lungen-6) has been recognized to be a marker for the activity of diffuse interstitial lung diseases. The purpose of the study is to evaluate serum KL-6 measurement as a marker for farmer's lung disease (FLD). DESIGN A cross-sectional survey of a cohort of dairy farmers. Retrospective measurement of KL-6 stored serum samples from those dairy farmers p...

Postexposure prophylaxis after sexual exposure to human immunodeficiency virus (HIV) is recommended by state and national agencies. A cross-sectional survey of 117 Los Angeles County sites found that 17 sites (14.5%) offer postexposure prophylaxis. Ten sites (8.5%) offer postexposure prophylaxis to patients who are uninsured. General availability of postexposure prophylaxis should be a public h...

This article describes the development of a novel sequential sampling method for the surveillance of transmitted HIV drug resistance by cross-sectional survey. Two commonly used sequential sampling methods are described and their applicability to the problem of classifying the prevalence of transmitted HIV drug resistance investigated. Both methods are rejected due to insufficient savings in sa...

Background: Under-nutrition contributes to childhood morbidity and mortality, particularly in low-income countries. While Rwanda is one of few countries on track to reduce the prevalence of underweight children under five years old by 50 % from 1990 to 2015 (a target of Millennium Development Goal1), underweight children remain a large public health problem with one out of ten children having l...

BACKGROUND Baseline information on physical activity is relevant to controlling the epidemic of chronic noncommunicable diseases occurring in many African countries. However, standardized data on physical activity are lacking in Nigeria. We assessed the prevalence of physical activity and its relationships with sociodemographic characteristics in a subnational sample of Nigerian adults. METHO...

AIMS To assess the variation in heavy drinking and alcohol dependence by living arrangements, and the contribution of social and behavioural factors to this variation. DESIGN The Health 2000 survey is a nationally representative cross-sectional survey conducted in Finland in 2000-2001 (N = 4589 in the age-range of 30-54 years, response rate 81%). MEASUREMENTS Living arrangements; married, c...

A randomized experiment with 1.6 million customers measures positive causal e↵ects of online advertising for a major retailer. The advertising profitably increases purchases by 5%. 93% of the increase occurs in brick-and-mortar stores; 78% of the increase derives from consumers who never click the ads. Our large sample reaches the statistical frontier for measuring economically relevant e↵ects....