What was I thinking? A theoretical framework for analysing panel conditioning in attitudes and (response) behaviour

Though panel data are increasingly used in the social sciences, the question whether repeatedly participating in a panel survey affects respondents’ attitudes and (response) behaviour is still largely unsolved. Drawing on a model of associative networks that is extended by assumptions on survey satisficing, we present a theoretical framework that emphasizes the role of strength-related attributes of attitudes (accessibility, internal consistency, extremity) and motivation in respondents’ information processing. In particular, we argue that – depending on respondents’ predispositions – occupation with survey questions enhances attitude strength, which results in increasing attitude stability and influence on thoughts and behaviours. Against this background, we bring together hitherto unconnected results from previous research and thus contribute to a more thorough understanding of both the mechanisms and the multifaceted outcomes of panel conditioning.     

Human factors methods to reduce medication error: using task analysis in a pediatric and adult pharmacy

Medication error is an issue that no hospital is immune from, leading to 7,000 deaths and 1.3 million patient injuries each year. The purpose of this study was to decrease the risk and occurrence of medication errors by analyzing the hospital pharmacy. Task analyses were performed and it was found that communication, expectation, and procedural issues were leading to the occurrence of the most common type of medication error in the pharmacy. Recommendations were made to improve the process and reduce the occurrence of this type of error.     

More on the distribution of the sum of uniform random variables

The paper provides a simplified derivation of the density of the sum of independent non-identically distributed uniform random variables via an inverse Fourier transform. We also provide examples illustrating the quality of the Normal approximation and corresponding MATHEMATICA code.     

Evolutionarily Stable Co-operative Commitments

If contracts cannot be fully specified Pareto optimal results may be closed off because individuals cannot rationally trust each other's promises. This paper assumes that human individuals can become internally committed not to act opportunistically and that others can detect to a certain extent whether they are dealing with an uncommitted (untrustworthy) or a committed (trustworthy) partner. Adopting an `indirect evolutionary approach' we show that co-operative commitments can survive in evolutionary competition even if conventional mechanisms like repetition, reputation, contract or promising are lacking. If detection of uncommitted individuals is neither too costly nor too unreliable there will in general be a `niche' for both committed and uncommitted actors even in one off large numbers' interactions.     

Relationship between Online Retailers’ Reputation and Product Returns

Customer product returns are key cost drivers that eat into online retailers’ profits. However, management research has neglected to examine ways of reducing return rates without causing a concomitant decrease in sales. Drawing from signalling and dissonance theories, we investigate the relationship between online retailers’ reputation and product return rates. Two experiments designed to produce causal conclusions show that reputation reduces return rates (Studies 1 and 2) and that return motivation is a boundary condition for that relationship (Study 2). A field study based on an online consumer panel demonstrates the robustness of the negative impact of online retailer reputation on product returns in a setting that emphasizes external validity (Study 3), in comparison with Studies 1 and 2, which maximize internal validity. Study 3 also examines managerially important contingencies of the causal relationship by considering three variables: purchase frequency; retailer type; and customer gender. Overall findings indicate that an online retailer's reputation is a powerful means of reducing product return rates. The findings also show that the strength of the relationship between reputation and product returns is influenced by return motivation and the three variables investigated in the field study.     

Different degrees of informational asymmetry on job markets and its impact on companies’ recruiting success

Based on a large survey of German companies, we investigate the influence of job characteristics on the recruiting success on labor markets with different degrees of informational asymmetry. We cluster companies’ recruiting channels in those with low (internal job markets and employee referrals) and high (job advertisements, the Federal Employment Agency and headhunters) degrees of informational asymmetry. We provide evidence that monetary aspects are important when quality aspects of the job and the company are not directly observable by job applicants. However, if recruiting channels are used where the level of asymmetric information is lower because applicants have more reliable information about job and company characteristics, the quality attributes of a workplace, such as flexible work times or a high job responsibility, become influential on the recruiting success. Finally, our results show that applicants with access to more information about the quality aspects of a job also seem to be in a better position to evaluate the information given with regard to their credibility.     

The General Expressions for the Moments of the Stochastic Shrinkage Parameters of the Liu Type Estimator

ABSTRACT

One of the problems with the Liu estimator is the appropriate value for the unknown biasing parameter d. In this article we consider the optimum value for d and give upper bound for the expected value of the estimator of this biasing parameter. We also derive the general expressions for the moments of the stochastic shrinkage parameters of the Liu estimator and the generalized Liu estimator. Numerical calculations are carried out to illustrate the behavior of the mean and variance of the biasing parameter. Also, a numerical example is given to illustrate the effect of the biasing parameter d, on the mean square error of the Liu estimator.     

On the characterization of maximum likelihood estimators for location-scale families

Given maximum likelihood equations for location and scale parameters, one determines conditions under which there exists a uniquely defined parametric statistical model, whose location and scale maximum likelihood estimators are the given ones. The constructive approach is exemplified at several kinds of mean estimators including the mean, mean square, mean mean and stretched power mean. The possible extension of the method to more general situations is discussed and illustrated at the sample median maximum likelihood estimator.     

Rate-optimal tests for jumps in diffusion processes

Suppose one has a sample of high-frequency intraday discrete observations of a continuous time random process, such as foreign exchange rates and stock prices, and wants to test for the presence of jumps in the process. We show that the power of any test of this hypothesis depends on the frequency of observation. In particular, if the process is observed at intervals of length $1/n$ 1 / n and the instantaneous volatility of the process is given by $ \sigma _{t}$ σ t , we show that at best one can detect jumps of height no smaller than $\sigma _{t}\sqrt{2\log (n)/n}$ σ t 2 log ( n ) / n . We present a new test which achieves this rate for diffusion-type processes, and examine its finite-sample properties using simulations.     

Job Stability Trends,Lay‐offs,and Transitions to Unemployment in West Germany

This paper examines the evolution of different aspects of job stability, notably the termination reasons and the transition states. We estimate Semi‐Parametric Cox Hazard Models with competing risks for West Germany and find an increasing hazard of job ending that is driven by an increasing hazard of being laid off, primarily. One explanation found is that men with fixed‐term contracts face increasing risks of being displaced. In accordance with the technological change hypothesis we also find that men with a high degree of non‐routine interactive tasks face a declining risk of displacement.