Evolution of repeated prisoner's dilemma play under logit dynamics

In an evolutionary set-up, we append an ecology of iterated prisoner's dilemma (IPD) game strategies, consisting of unconditional cooperators (AllC), unconditional defectors (AllD) and reactive players (TFT) with two repeated strategies that have received less attention in the evolutionary IPD game literature: the error-proof, “generous” tit-for-tat (GTFT) which, with a certain probability, re-establishes cooperation after a (possibly by mistake) defection of the opponent and the penitent, “stimulus–response” (WSLS) strategy that resets cooperation after the opponent punished for defection. An abundance of rock–paper–scissors like patterns is discovered in the 3×3 ecologies comprising Pavlovian and “generous” players. Interestingly, the evolutionary success of Pavlov seems to depend on the absence of unconditional cooperators in the ecologies investigated.     

Changes in psychological contracts during the global financial crisis: the manager's perspective

The employee–organisation relationship is dynamic and arguably affected by contextual factors, such as a change in the economic environment. This study uses data collected from managers in Australia before and after the beginning of the global financial crisis (GFC) to examine the changes in psychological contract (PC) terms from the manager's perspective. In particular, as industries can be affected differently by economic crisis and gender discrimination can increase in tough economic conditions, we examined if any changes in PC terms were contingent on industry and employee gender. The study's results show that the terms of the employment relationship deteriorated in Australia only for employees working in industries affected by the GFC. Further, we found that some gender differences in the terms of the PC exist independent of the state of the economy. In addition, a three-way interaction indicates that managers working in industries not affected by the GFC are allocating a greater proportion of their resources to their female employees than to their male employees. Ongoing labour shortages and gender inequities in Australia might have prompted managers in non-affected industries to use their relative ‘resource-rich’ advantage to positively influence the employee–organisation relationship for female employees, a traditionally disadvantaged group.     

Workforce diversity and firm performance: Relational coordination as a mediator and structural empowerment and multisource feedback as moderators

Workforce composition in organizations has become increasingly diverse. As an important step in determining how workforce diversity leads to firm performance, we proposed relational coordination as a mediator through which diversity in age and education indirectly affects firm performance. We also highlighted two human resource management practices (structural empowerment and multisource feedback) as critical contingencies that moderate the effects of workforce diversity on relational coordination and firm performance. We conducted hierarchical multiple regression on multisource data (including responses from senior directors, department directors, managers, and employees, as well as financial performance) from 189 Korean firms in the manufacturing sector, which yielded support for our hypotheses. These findings offer novel theoretical and practical insights into the effective management of workforce diversity.     

小议汽车自燃的成因与应对办法

随着汽车的普及,相关问题也日渐增多,本文从汽车自燃现象说起,重点阐释了汽车自燃的电路诱因,并提出具体的预防措施。     

Small‐scale Inference: Empirical Bayes and Confidence Methods for as Few as a Single Comparison

Empirical Bayes methods of estimating the local false discovery rate (LFDR) by maximum likelihood estimation (MLE), originally developed for large numbers of comparisons, are applied to a single comparison. Specifically, when assuming a lower bound on the mixing proportion of true null hypotheses, the LFDR MLE can yield reliable hypothesis tests and confidence intervals given as few as one comparison. Simulations indicate that constrained LFDR MLEs perform markedly better than conventional methods, both in testing and in confidence intervals, for high values of the mixing proportion, but not for low values. (A decision‐theoretic interpretation of the confidence distribution made those comparisons possible.) In conclusion, the constrained LFDR estimators and the resulting effect‐size interval estimates are not only effective multiple comparison procedures but also they might replace p‐values and confidence intervals more generally. The new methodology is illustrated with the analysis of proteomics data.