The resolution of a set of n tests o r other var ia tes into components 7~, each of which accounts for the greates t possible port ion 71, ~,~, . , of the total variance of the tests unaccounted for by the previous components, has been dealt with by the author in a previous paper (2). Such "factors ," on account of their analogy with the principal axes of a quadric, have been called principal c...

John Abelson Frederick W. Alt Don L. Anderson Michael Ashburner Stephen J. Benkovic David E. Bloom Floyd E. Bloom Piet Borst Michael S. Brown Henry R. Bourne James J. Bull Kathryn Calame C. Thomas Caskey Dennis W. Choi John M. Coffin Paul J. Crutzen Robert Desimone Nicole Le Douarin Bruce F. Eldridge Paul T. Englund Richard G. Fairbanks Douglas T. Fearon Harry A. Fozzard K. Friedrich Theodore H...

Kathryn Calame C. Thomas Caskey Dennis W. Choi John M. Coffin Paul J. Crutzen Robert Desimone Nicole Le Douarin Bruce F. Eldridge Paul T. Englund Richard G. Fairbanks Douglas T. Fearon Harry A. Fozzard Klaus Friedrich Theodore H. Geballe Margaret J. Geller John C. Gerhart Roger 1. M. Glass Stephen P. Goff Peter N. Goodfellow Corey S. Goodman Stephen J. Gould Ira Herskowitz Eric F. Johnson Steph...

John Abelson Frederick W. Alt Don L. Anderson Michael Ashburner Stephen J. Benkovic David E. Bloom Floyd E. Bloom Piet Borst Michael S. Brown Henry R. Bourne James J. Bull Kathryn Calame C. Thomas Caskey Dennis W. Choi John M. Coffin Paul J. Crutzen Robert Desimone Nicole Le Douarin Bruce F. Eldridge Paul T. Englund Richard G. Fairbanks Douglas T. Fearon Harry A. Fozzard K. Friedrich Theodore H...

Taking an evolutionary view of markets, Harold Demsetz hypothesized that firms ., differ persistently in efficiency and that industry concentration results from growth of ., efficient firms at the expense of inefficient ones. We test the hypothesis with high quality microdata from the US hospital industry, an industry of keen policy and scientific interest. We measure efficiency by firm in the ...

Case 3.1: Harold Harold is a 6-year-old boy recently evaluated by his pediatrician for developmental delay and autistic-like features. Harold’s mother reported early problems with speech production, hyperactivity, and aggressive outbursts. More recently the behavioral problems have intensified, and Harold has begun to hand bite. On physical examination, the pediatrician notes that Harold has a ...

It was on Thanksgiving day in 1931 that Harold Clayton Urey found definitive evidence of a heavy isotope of hydrogen. Urey's discovery of deuterium is a story of the fruitful use of primitive nuclear and thermodynamic models. But it is also a story of missed opportunity and errors—errors that are particularly interesting because of the crucial positive role that some of them played in the disco...