The Equivalence of Two Proportions Revisited

The classic conditional test for checking that the difference between two independent proportions is not null may not be appropriate in many circumstances. Dunnett & Gent (1977) showed that in clinical trials, in studies of drugs, etc, the aim is to prove the practical equality (equivalence) of both proportions. On other occasions the aim may be the opposite: i.e. to prove that the two proportions are substantially different (biologically significant). Both cases are usually solved by two one-sided tests (TOST test). In this article, this procedure is shown to be conservative and two true two-sided tests for each case are proposed.     

Variation in Cancer Risk Estimates for Exposure to Powerline Frequency Electromagnetic Fields: A Meta-Analysis Comparing EMF Measurement Methods

We used meta-analysis to synthesize the findings from eleven case-control studies on cancer risks in humans exposed to 50-60 Hertz powerline electromagnetic fields (EMFs). Pooled estimates of risk are derived for different EMF measurement methods and types of cancer. EMF measurement methods are classified as: wiring configuration codes, distance to power distribution equipment, spot measurements of magnetic fields, and calculated indices based on distance to power distribution equipment and historic load data. Pooled odds ratios depicting the risk of cancer by each measurement type are presented for all cancers combined, leukemia for all age groups and childhood leukemia. The wire code measurement technique was associated with a significantly increased risk for all three cancer types, while spot measures consistently showed non-significant odds ratios. Distance measures and the calculated indices produced risk estimates which were significant only for leukemia.     

A cross-cultural investigation of the shared values relationship

Data from managers in Australia (N=505) and Hong Kong (N=653) support the findings of studies using American managers and their companies that shared values, or person-organization values fit, is strongly related to positive work attitudes. This relationship is unaffected by culture, as two-way analysis of variance reveals no interaction effect between shared values and country. Managerial implications are discussed.     

The role and function of drinking games in a university community

Understanding the role of drinking games in college student life is critical for program planners who wish to develop education and prevention programs to reduce abusive drinking. Drinking games are popular social activities that provide a focus for social interactions but place students at considerable risk for serious consequences. This article reports preliminary results of a study using participant observation and in-depth interviews to develop a typology of drinking games and describe patterns and practices associated with the games.     

The social bases of declining infant mortality: Lessons from a nineteenth-century Italian town

Studies of the historical decline of infant mortality in the West have relied mainly on aggregate-level data. We use the Italian population register and related sources to look more directly at the social forces bearing on declining infant mortality. We focus on the town of Casalecchio di Reno, an agricultural community near Bologna, for a period (1865–1921) in which the town shifted from sharecropping to a wage-labour economy, and mortality rates declined sharply. The implications of various social and demographic factors for the likelihood of infant death are examined and related to explanations of the historical decline in infant mortality.     

The effect of non-traditional attitudes on married women's labor supply

This paper uses repeated cross sections from the General Social Survey to test whether married women's labor force participation responds to how traditional her attitudes are concerning a woman's role. Such attitudes are important predictors of labor force participation in any given year. On the other hand, attitude variables do not explain the increase in women's labor force participation during the 1970's.