An ergonomic comparison between mechanical and manual patient transfer techniques

Multiple studies have concluded that manual patient transfer and repositioning techniques are a significant cause of low back injuries. The objective of this study was to compare the low back stresses resulting from the use of two different mechanical patient transfer assist devices with the use of traditional manual transfer techniques. The mechanical transfer systems used were the Barton Patient Transfer System and a Sling-Suspension Lift similar to a "Hoyer Lift". The back compressive forces derived using the Michigan 3D Static Strength Model (Version 4.0) and electromyography (EMG) of the muscles of the low back were compared. This study found that the mechanical assist devices placed less stress on the low back and were more desirable to use than the traditional manual techniques. The Barton System was found to be, in general, less hazardous and more preferred than the Sling Suspension Lift.     

Dreams of Pure Sociology

Unlike older sciences such as physics and biology, sociology has never had a revolution. Modern sociology is still classical—largely psychological, teleological, and individualistic—and even less scientific than classical sociology. But pure sociology is different: It predicts and explains the behavior of social life with its location and direction in social space—its geometry. Here I illustrate pure sociology with formulations about the behavior of ideas, including a theory of scienticity that predicts and explains the degree to which an idea is likely to be scientific (testable, general, simple, valid, and original). For example: Scienticity is a curvilinear function of social distance from the subject. This formulation explains numerous facts about the history and practice of science, such as why some sciences evolved earlier and faster than others and why so much sociology is so unscientific. Because scientific theory is the most scientific science, the theory of scienticity also implies a theory of theory and a methodology for the development of theory.     

Optimal Two‐Sided Invariant Similar Tests for Instrumental Variables Regression

This paper considers tests of the parameter on an endogenous variable in an instrumental variables regression model. The focus is on determining tests that have some optimal power properties. We start by considering a model with normally distributed errors and known error covariance matrix. We consider tests that are similar and satisfy a natural rotational invariance condition. We determine a two‐sided power envelope for invariant similar tests. This allows us to assess and compare the power properties of tests such as the conditional likelihood ratio (CLR), the Lagrange multiplier, and the Anderson–Rubin tests. We find that the CLR test is quite close to being uniformly most powerful invariant among a class of two‐sided tests. The finite‐sample results of the paper are extended to the case of unknown error covariance matrix and possibly nonnormal errors via weak instrument asymptotics. Strong instrument asymptotic results also are provided because we seek tests that perform well under both weak and strong instruments.     

Frank Parsons and the Progressive Movement

This article recounts the social influences that must have inspired Frank Parsons to create vocational counseling and traces the profession's early development.     

The difficult and ubiquitous problems of multiplicities

Multiplicities are ubiquitous. They threaten every inference in every aspect of life. Despite the focus in statistics on multiplicities, statisticians underestimate their importance. One reason is that the focus is on methodology for known multiplicities. Silent multiplicities are much more important and they are insidious. Both frequentists and Bayesians have important contributions to make regarding problems of multiplicities. But neither group has an inside track. Frequentists and Bayesians working together is a promising way of making inroads into this knotty set of problems. Two experiments with identical results may well lead to very different statistical conclusions. So we will never be able to use a software package with default settings to resolve all problems of multiplicities. Every problem has unique aspects. And all problems require understanding the substantive area of application.     

Linguistic competition and education spending in Spain 1992–2008

Linguistic competition occurs when two or more linguistic groups vie against each other for resources from the same state. What are the effects of this competition on education spending? In this paper, we examine two competing explanations. On the one hand, there is the claim that increasing levels of ethno-linguistic diversity can decrease education spending. On the other hand, there is also the argument that education spending is higher when there is electoral competition. Using a newly assembled dataset of education spending at the subnational level for Spain (1992–2008), we test these two arguments. We find (1) while ethno-linguistic diversity matters for spending, the effect is not in the expected direction and (2) electoral competition can affect education spending. We also find that the type of education curriculum (monolingual versus bilingual) can moderate the effects of ethno-linguistic diversity. These results shed light on the commonly held belief that diversity stunts education spending.     

Source of complexity in the social and managerial sciences: an extended Sen’s theorem

Many disciplines, including the social, behavioral, and management sciences, search for appropriate aggregated outcomes—a search that can be frustrated by complexities and inefficiencies. As shown here, explanations for these difficulties can be found in social choice. Indeed, it is shown why some of these problems are direct consequences of adopted approaches (e.g., management style, choice of a division of labor, or even the use of expertise and experts), and they cannot be avoided. These results are motivated by Sen’s Theorem from decision theory.