NASA's Turbofan Engine Concept Study for a Next-Generation Single-Aisle Transport: Presentation to ICAO's Noise Technology Independent Expert Panel

No abstract availabl

A Survey of Laboratory and Statistical Issues Related to Farmworker Exposure Studies

Developing internally valid, and perhaps generalizable, farmworker exposure studies is a complex process that involves many statistical and laboratory considerations. Statistics are an integral component of each study beginning with the design stage and continuing to the final data analysis and interpretation. Similarly, data quality plays a significant role in the overall value of the study. Data quality can be derived from several experimental parameters including statistical design of the study and quality of environmental and biological analytical measurements. We discuss statistical and analytic issues that should be addressed in every farmworker study. These issues include study design and sample size determination, analytical methods and quality control and assurance, treatment of missing data or data below the method’s limits of detection, and post-hoc analyses of data from multiple studies

Industrial Concentration, Price-Cost Margins, and Innovation. Japan And The World Economy,

abstract This paper explores a panel data set matching establishment-based production statistics from Japan's Census of Manufacturers with wholesale price indices from the Bank of Japan, and Herfindahl indices from the Japan Fair Trade Commission. The data include annual observations over the period , for 74 industries at the 4 digit s.i.c. level. We estimate Cobb-Douglas production functions and Solow residuals for each industry and then use these estimates to further analyse the determinates of industrial concentration and innovation. The industries having large scale, great capital intensity and with high price-cost margins tend to be more concentrated. We find a U-shaped mapping from concentration to innovation in the cross-section. We also find an inverted-U shaped mapping from price-cost margin to innovation, but only in a pooled two-way fixed effects regression, and which we argue is spurious. JEL classifications L11, L13, L60, O30