Longitudinal studies in organizational stress research: a review of the literature with reference to methodological issues

Demonstrating causal relationships has been of particular importance in organizational stress research. Longitudinal studies are typically suggested to overcome problems of reversed causation and third variables (e.g., social desirability and negative affectivity). This article reviews the empirical longitudinal literature and discusses designs and statistical methods used in these studies. Forty-three longitudinal field reports on organizational stress were identified. Most of the investigations used a 2-wave panel design and a hierarchical multiple regression approach. Six studies with 3 and more waves were found. About 50% of the studies analyzed potential strain-stressor (reversed causation) relationships. In about 33% of the studies there was some evidence of reverse causation. The power of longitudinal studies to rule out third variable explanations was not realized in many studies. Procedures of how to analyze longitudinal data are suggested.     

Computer construction of equal-angle fabric diagrams and program comparisons

Several existing computer programs producing fabric diagrams with symbols or contour lines are either not available, or inefficient and difficult to handle. The computer program presented here considers a 1-percent spherical counting area on the lower hemisphere, calculates the densities on a spherical grid, develops the contours, and projects them in an equal-angle mode on the meridial plane. This program is small, accurate, and efficient, handles all data points in a systematic manner, and may be easily applied in geosciences.     

Borna disease virus infection in animals and humans

Tomographic reconstructions of biological specimens are now routinely being generated in our high voltage electron microscope by tilting the specimen around two orthogonal axes. Separate tomograms are computed from each tilt series. The two tomograms are aligned to each other with general 3-D linear transformations that can correct for distortions between the two tomograms, thus preserving the inherent resolution of the reconstruction throughout its volume. The 3-D Fourier transforms of the two tomograms are then selectively combined to achieve a single tomogram. Unlike a single-axis tomogram, a dual-axis tomogram shows good resolution for extended features at any orientation in the plane of the specimen; it also has improved resolution in the depth of the specimen. Calculations indicate that the improvements available from double tilting and from tilting to higher angles are largely additive. Actual and model data were used to assess whether varying the increment between tilted views in proportion to the cosine of the tilt angle would allow a reduction in the number of pictures required to achieve a given resolution of reconstruction. Analysis by Fourier sector correlation indicated that the variable tilt increment improved the reconstruction in some respects but degraded it in others. A varying tilt increment thus does not give an unqualified improvement, at least when using back-projection algorithms for the reconstruction.     

Organizational Error Management Culture and Its Impact on Performance: A Two-Study Replication.

The authors argue that a high-organizational error management culture, conceptualized to include norms and common practices in organizations (e.g., communicating about errors, detecting, analyzing, and correcting errors quickly), is pivotal to the reduction of negative and the promotion of positive error consequences. Organizational error management culture was positively related to firm performance across 2 studies conducted in 2 different European countries. On the basis of quantitative and qualitative cross-sectional data from 65 Dutch organizations, Study 1 revealed that organizational error management culture was significantly correlated with both organizational goal achievement and an objective indicator of economic performance. This finding was confirmed in Study 2, using change-of-profitability data from 47 German organizations. The results suggest that organizations may want to introduce organizational error management as a way to boost firm performance. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Advocacy, recovery, and the challenges of consumerism for schizophrenia

Advocacy organizations such as the National Alliance for the Mentally Ill (NAMI) and patient consumer groups are playing an ever-increasing role in public health policy and patient care in schizophrenia. The recovery philosophy which recognizes the unique contributions of those who have experienced mental illness is now a part of treatment approaches in many states. Several states have extended these consumer initiatives to incorporate advance directives, an approach that has generated much debate. The NAMI destigmatization campaign, grounded in the neurobiology of major mental illness, is an unprecedented, concerted effort to change public opinion and to achieve parity at all levels for persons with severe and persistent mental illness. This article describes and chronicles these initiatives and explores their implications for the management of schizophrenia into the next millenium.     

Establishing the next generation at work: Leader generativity as a moderator of the relationships between leader age, leader-member exchange, and leadership success.

In this study, the authors investigated leader generativity as a moderator of the relationships between leader age, leader-member exchange, and three criteria of leadership success (follower perceptions of leader effectiveness, follower satisfaction with leader, and follower extra effort). Data came from 128 university professors paired with one research assistant each. Results showed positive relationships between leader age and leader generativity, and negative relationships between leader age and follower perceptions of leader effectiveness and follower extra effort. Consistent with expectations based on leadership categorization theory, leader generativity moderated the relationships between leader age and all three criteria of leadership success, such that leaders high in generativity were better able to maintain high levels of leadership success at higher ages than leaders low in generativity. Finally, results of mediated moderation analyses showed that leader-member exchange quality mediated these moderating effects. The findings suggest that, in combination, leader age and the age-related construct of generativity importantly influence leadership processes and outcomes. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

The effects of an active development of the mental model in the training process: experimental results in a word processing system

Three different training programmes for a word processing system were experimentally compared: (1) a sequential programme, which taught low-level skills and which did not help the user actively to develop a mental model, (2) a hierarchical programme, which provided an explicit and integrated conceptual model of the system to the user and (3) a programme in which the users were asked to develop hypotheses on the functioning of the software and in which they were encouraged to use an active and exploratory approach. From an action theory point of view it was hypothesized that the third group would be superior to the first group. In an experimental study with two training sessions each of two hours and a two-hour testing session (n = 15), this was shown to be the case for several performance criteria (error time, transfer and experimenter rating). Additionally, an interindividual difference variable lo measure the individual learning style was used, giving results that could be interpreted in a similar way to the experimental results.     

An efficient construction of equal-area fabric diagrams

Fabric analysts are confronted by massive computerization requirements to process and synthesize efficiently the vast volume of accumulating fabric data. The efficient application of the computer to density-contour and plot-fabric data in an equal-area projection is given by the method which presents the most economical, reproducible, and accurate fabric diagram. Optimizing these features requires a new technique which unifies the construction of the fabric diagram completely in terms of the geometry of the reference sphere. In effect the new method determines the fabric diagram on the surface of the reference sphere and projects it, subsequently, onto the meridial plane. Although the procedure is not feasible to perform manually, it can be performed readily by digital computer to yield highly economic, reproducible, and accurate fabric diagrams. A simple computer program of the procedure, as well as an application, illustrate the capabilities of the method.     

Exploration strategies, performance, and error consequences when learning a complex computer task

When trying to learn a complex task, people can use different strategies. They can use systematic exploration in which they take on an active approach to discover the computer functions and make use of problem solving steps such as planning, evaluation of feedback, and control of emotion and motivation. Alternatively, they can use non-systematic strategies like trial-and-error, rigid exploration, and encapsulation in information seeking. This study examined whether the exploration strategies were related to error consequences and performance when people learned a new computer program. Strategies were assessed by means of coding. Analysis showed strong correlations between strategies, error consequences, and task performance. These results can have implications for training design and human reliability in dealing with complex devices.