Selecting representative case vignettes for clinical judgement studies: Examples from two heart failure studies

In the Clinical Judgement Analysis (CJA) tradition there are strong arguments in favour of using representative case vignettes. Due to methodological and practical constraints, however, it is often necessary to make compromises regarding representativity. In this article, we discuss our experiences in working with these problems in connection with two studies about general practitioners heart failure diagnoses. CJA is a method for investigating and describing decision-making in which both judges and judgement situations are taken into consideration. This means that when we want to study physicians diagnoses, both the participating physicians as well as the case vignettes should be sampled to be representative for the diagnostic situation. If representativity is interpreted in a strictly statistical sense, the case vignettes should reflect a well identified population of patients regarding values, distribution and intercorrelations of the relevant patient characteristics (variables). Creating a set of representative case vignettes meeting all theoretical requirements will often be difficult. Selecting a relevant population and relevant variables, deciding about the appropriate number of variables and case vignettes, and deciding whether authentic patients or constructed case vignettes should be used are some of the problems that must be dealt with.     

A Methodology for Assessing Organizational Core Values*

abstract The goal of this study is to offer a methodology for empirically assessing the core values of an organization. It uses means–end analysis in order to determine those values that organization members manifest in their daily behaviour, and which are not just espoused ‘truisms’. The method is based on the sense members of an organization make of what they do. Sensemaking follows a means–end pattern, through which individual actions converge into central values. The values most central in this means–end structure are the core values that effectively motivate organization members in their job. Our method works in two steps: first, exploratory interviews using the laddering‐technique establish the values potentially most central to the organization; then, a follow‐up survey assesses the complete pattern of means–end relations among the potential values. Validity tests show that the most central values derived from this survey data are the most important to organization members. These values are also the most stable over time. We make a comparison of this method with traditional value surveys and we discuss its implications for the study of organizational behaviour.     

Multiple Inference and Market Integration: An Application to Swedish Fish Markets

This paper, in contrast to earlier studies, tests market integration using a methodology that accounts for the multiplicity problem inherent in testing several time series. This method minimises the risk of finding spurious evidence of market integration. We examine market integration among 12 fish species in Sweden by applying cointegration tests, which identify market integration for two separate clusters of species. Furthermore, we find that the Law of One Price holds for 6 of the 12 species considered.     

Asset pricing in large information networks

We study asset pricing in economies with large information networks. We focus on networks that are sparse and have power law degree distributions, in line with empirical studies of large scale social networks. Our theoretical framework yields a rich set of novel asset pricing implications. We derive closed form expressions for price, volatility, profitability and trading volume, as functions of the network topology. We also study agent welfare and show that the network that optimizes total welfare is typically a uniform one with an intermediate degree of connectedness.     

Testing slope homogeneity in large panels with serial correlation

Pesaran and Yamagata (Pesaran, M.H., Yamagata, T., Testing slope homogeneity in large panels, Journal of Econometrics 142, 50–93, 2008) propose a test for slope homogeneity in large panels, which has become very popular in the literature. However, the test cannot deal with the practically relevant case of heteroskedastic and/serially correlated errors. The present note proposes a generalized test that accommodates both features.     

Investment with weak contract enforcement: evidence from Hungary during transition

This paper aims to provide empirical evidence relating to theimportance of contract enforcement for development. Survey dataon Hungarian farms are used to estimate the impact of contracthold-ups on investment. We find that investment is affectedby a variety of factors. Contract breaches in the form of delayedpayments have a non-linear effect on investment: at high levels,they significantly deter the investment, but not at low levels.