Studies on Spectrophotometry (Part 11)

Data analysis of epidemiological studies: part 11 of a series on evaluation of scientific publications.

INTRODUCTION An important objective of epidemiological research is to identify risk factors for disease. Depending on the particular question being asked, cohort studies, case-control studies, or cross-sectional studies are conducted. METHODS Methods of data analysis in different types of epidemiological studies are illustrated through examples with fictive data. Important measures of frequen...

Part 11. Viewpointing.

An Analysis of the Lumber Part 11

. Numben in parentheses refer to I.iterl~e Cited. Report of study of the peripheral-milling process of planing lumber. Relationships were determined between cutterhead horsepower and various combinations of specimen, cutterhead, and feed factors. Power demand curves are interpreted by comparison with simultaneous one micro-second photos of chips. Secondary consideration is given to quality of s...

11. Opiate-ethanol Interaction Studies

Andrew K.S. Ho, Raymond C.A. Chen and J. Michael Morrison* Peoria School of Medicine, University of Illinois, Peoria, Illinois, and National Institute on Drug Abuse, Rockville, Maryland. * This work was supported by a contract from NIDA ADM-45-74220. The authors wish to thank Drs. Monique Braude, Lou Harris, Mary Jean Kreek, Elliot Vessel and Charles Schuster for valuable suggestions, and encou...

The effects of water content on diffuse reflectance spectrophotometry studies of deep-sea sediment cores

Sediment cores recovered during ODP drilling operations are commonly scanned using a Minolta CM-2002 spectrophotometer to obtain spectral data. Core processing procedures aboard the JOIDES Resolution require that these spectral data be measured on wet cores. However, the effects of changing water content on the spectra of marine sediments is unknown. We examined the effects of changing water co...