Critical realism in empirical research: employing techniques from grounded theory methodology

Whilst critical realism (CR) is becoming recognised as a significant meta-theory for the social sciences, there is little guidance on how to produce research which is consistent with its ontological and epistemological assumptions. This article contributes to an emerging discussion about how CR can be applied, drawing on an example of a qualitative study that has sought to understand and explain the causes of unmet need amongst a group of rural labourers in Tunisia . Using this study as an illustration, I show how techniques from grounded theory methodology can be usefully harnessed in the data collection, coding and analysis stages of a research project that adopts a CR philosophical and methodological framework. I illustrate how an ‘abductive’ variant of grounded theory allowed drawing on pre-existing theoretical knowledge throughout the research stages; whilst open and axial coding techniques could be harnessed for identifying and postulating CR causal mechanisms. This article should be of interest to students and researchers involved with grounded theory and applied critical realism.     

IDENTIFYING THE EFFECTS OF MONETARY POLICY SHOCKS ON EXCHANGE RATES USING HIGH FREQUENCY DATA

This paper proposes a new approach to identifying the effects of monetary policy shocks in an international vector autoregression. Using high‐frequency data on the prices of Fed Funds futures contracts, we measure the impact of the surprise component of the FOMC‐day Federal Reserve policy decision on financial variables, such as the exchange rate and the foreign interest rate. We show how this information can be used to achieve identification without having to make the usual strong assumption of a recursive ordering. (JEL: C32, E52, F30)     

FREE PRODUCT TRIALS: DISCLOSING QUALITY AND MATCH VALUE

A prepurchase trial allows a consumer to learn both a product's quality and how well it matches her idiosyncratic taste. By offering a trial, the marginal seller thus shifts up demand by increasing perceived quality and rotates demand by revealing match. In contrast to classic results,a trial is offered only when quality is sufficiently high, and sometimes not at all. Fewer trials are offered when match is more important and when there are fewer gains from trade. “Cooling off” rules allowing free returns are effectively mandatory trials, benefiting consumers but decreasing welfare when there are sufficient gains from trade. (JEL D18, L15, L5)     

On-line expectation–maximization algorithm for latent data models

Summary.  We propose a generic on-line (also sometimes called adaptive or recursive) version of the expectation–maximization (EM) algorithm applicable to latent variable models of independent observations. Compared with the algorithm of Titterington, this approach is more directly connected to the usual EM algorithm and does not rely on integration with respect to the complete-data distribution. The resulting algorithm is usually simpler and is shown to achieve convergence to the stationary points of the Kullback–Leibler divergence between the marginal distribution of the observation and the model distribution at the optimal rate, i.e. that of the maximum likelihood estimator. In addition, the approach proposed is also suitable for conditional (or regression) models, as illustrated in the case of the mixture of linear regressions model.     

Space-time generation of high intensity patterns using growth-interaction processes

We describe a novel spatial-temporal algorithm for generating packing structures of disks and spheres, which not only incorporates all the attractive features of existing algorithms but is also more flexible in defining spatial interactions and other control parameters. The advantage of this approach lies in the ability of marks to exploit to best advantage the space available to them by changing their size in response to the interaction pressure of their neighbours. Allowing particles to move in response to such pressure results in high-intensity packing. Indeed, since particles may temporarily overlap, even under hard-packing scenarios, they possess a greater potential for rearranging themselves, and thereby creating even higher packing intensities than exist under other strategies. Non-overlapping pattern structures are achieved simply by allowing the process to ‘burn-out’ at the end of its development period. A variety of different growth-interaction regimes are explored, both symmetric and asymmetric, and the convergence issues that they raise are examined. We conjecture that not only may this algorithm be easily generalised to cover a large variety of situations across a wide range of disciplines, but that appropriately targeted generalisations may well include established packing algorithms as special cases.     

What's left in the community? Oppositional politics in contemporary practice

The growth of community-based not-for-profits in the Anglo-Americanworld has been mirrored by weakened political demands and adiminished set of critical political perspectives. Nevertheless,significant efforts in Anglo-American communities still existand provide examples of community-based organizing that havenot lost sight of the goals of social and economic justice.This article explores practice examples that demonstrate theexistence and possibilities of politically oppositional communityorganizing in the current difficult and complex political economy.These examples present effective, if imperfect, community initiatives.The three discussed – The Fifth Avenue Committee, ACORN,and Immigrant Worker Centres – offer alternatives to contemporaryforms of community practice moderated by economic globalizationand the policies of neo-liberalism. The article ends by drawinglessons from these experiences and their potential in the contemporarypolitical economy.     

The impact of specific occupation on mortality in the U.S. National Longitudinal Mortality Study

We compare mortality differences for specific and general categories of occupations using a national cohort of approximately 380,000 persons aged 25-64 from the U.S. National Longitudinal Mortality Study. Based on comparisons of relative risk obtained from Cox proportional-hazards model analyses, higher risk is observed in moving across the occupational spectrum from the technical, highly skilled occupations to less-skilled and generally more labor-intensive occupations. Mortality differences obtained for social status groups of specific occupations are almost completely accounted for by adjustments for income and education. Important differences are shown to exist for selected specific occupations beyond those accounted for by social status, income, and education. High-risk specific occupations include taxi drivers, cooks, longshoremen, and transportation operatives. Low-risk specific occupations include lawyers, natural scientists, teachers, farmers, and a variety of engineers.     

十字路口的中国管理研究: 一些哲学层面的思考

这篇评论从哲学层面讨论一些关于中国管理研究情境化的问题.首先需要注意的是,不同的哲学派系可以对情境化进行不同的解释;其次,根据迪昂-奎因( Duhem - Quine)论题,实证普适性的重复检验是一种适合在中国情境下测试西方理论的方法;第三,由于难以确定性地推翻已有的管理理论,试图创造新的理论来解释独特的中国管理现象,可能导致理论的过度繁衍,并延续薄弱甚至虚假的理论;最后,文章建议用实证规律式的研究作为理论应用和理论创新以外的另一选择.