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Mar 21, There is often overlap between the discussion and conclusion, and in some to avoid when writing the discussion section of your dissertation.

Further, weights are applied so that more precise estimates from larger samples count more than less precise estimates from smaller samples. Though there are two dominant approaches for calculating weights — one using sample size Schmidt and Hunter, and the other using the inverse variance that is also based on sample size — Hedges and Olkin, — both yield similar results and give much more precise estimates wherein statistical significance is based on both the number of studies and the total number of observations across studies Schmidt and Hunter, Most prominent among these is measurement error.

Based on an analysis of over 5, published correlations, Aguinis et al. Perhaps because Hunter et al. Aguinis et al.

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Glass and Hedges and Olkin , in contrast, performed education research and were centrally interested in identifying variables — i. They naturally adopted and refined a different method that we also summarize — i. These three approaches are summarized in Table 1. Given that a substantial body of management research uses qualitative paradigms e.

In order to more fully develop scientific evidence, management research can benefit from also synthesizing qualitative evidence. The idea of synthesizing qualitative research is not new. The aims of QMA are threefold. First, it should yield insights not available via quantitative methods and thus help fill knowledge gaps left behind when relying exclusively on such methods.

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Second, QMA aggregates evidence on comparable aspects of phenomena across studies to substantiate generalizable theoretical insights. Finally, it seeks to develop new theoretical interpretations that go beyond findings reported in primary studies Noblit and Hare, In accordance with its multiple goals, there are many approaches to synthesizing qualitative research. A useful distinction can be made between interpretive and aggregative approaches Rauch et al.

Aggregative synthesis, in contrast, accumulates evidence within and across cases to substantiate generalizable theoretical principals e. Aggregative and interpretative approaches overlap. Both content analysis and cumulative case studies involve formally coding case studies to quantify qualitative data.

Miller and Friesen , for example, developed a coding scheme based on a priori theory that was applied to 81 cases published in Fortune and the Harvard Case Clearing House , which allowed them to contrast successful and unsuccessful strategic archetypes. The disadvantage is that these methods do not allow researchers to study processes. Qualitative comparative analysis, in contrast, is better suited for describing processes because it focuses on identifying necessary and sufficient conditions for particular outcomes to be observed.

This method has been used to synthesize complex intervention research Kahwati et al. While qualitative comparative analysis has been used in management research e. While QMA methods such as content analysis, cumulative case studies, and qualitative comparative analysis have delivered important insights in a number of research domains, one challenge is that contextual factors found in the original cases can be stripped out as data are aggregated.

Another challenge is that these approaches are based on a realist philosophical foundation, an assumption that is not widely shared among researchers relying on qualitative research designs Rauch et al.

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A study by Habersang et al. The authors develop a process model of organizational failure combining deductive and inductive steps to analyse 43 published case studies and move beyond the simple internal versus external causes of organizational failure found in prior research. They describe four process archetypes through which organizational failure occurs i.

Each of these prototypes is driven by distinct sequences of rigidity and conflict mechanisms. The study provides new theorizing that can be the basis of future quantitative or qualitative investigations. Given that QMA is uncommon in management research, the study serves as an important example of how to utilize qualitative research as input for aggregating evidence and building new theory. It also allows researchers to perform dominance analyses wherein the relative importance of competing predictors is compared Budescu and Azen, MASEM involves two steps.

One advantage of this approach is that data usually correlations can be included from any primary study that investigates a relationship between any of the variables of interest, even if the study does not investigate any of the other relationships needed for the MASEM. Statistical tests of structural models and their paths in primary research depend on sample size. MASEM has a number of strengths, such as allowing researchers to control for alternative explanations i. However, there are also challenges.

Finally, it is difficult to test moderator variables Bergh et al. Fortunately, there is a rich literature emerging with suggestions how to handle these problems Tang and Cheung, ; Yu et al. Carnes et al. Building on insights from competitive dynamics research e. They combine evidence from almost 24, organizations and find that outcome e.

By calculating the mediating paths of each control type through the others, they showed that these controls are complementary in that they have even stronger effects when used in conjunction with one another. Many researchers and practitioners have long thought these controls act as substitutes i.

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Further, their approach to assessing complementarity versus substitution effects can serve as a blueprint for others. Dominance analysis uses the change in R 2 from a series of regressions to identify which predictors are most important, or dominant, with respect to outcomes see Budescu and Azen, for a summary. Karam et al.

Overall, their main thesis is that these two sets of influences — leadership behaviours and organizational justice — need to be considered jointly. These were later adopted by criminal justice researchers Mark Lipsey and David Wilson in , and the approach has become increasingly popular. Unlike personnel selection researchers e. Accordingly, these researchers advanced MARA as a way to simultaneously investigate a large number of factors, such as sample demographics, measurement technique, or study design features that potentially moderate and thus explain why different studies find different effects for key relationships.

These can be study features such as year published, measurement or treatment approach used, study design features e. Significant regression coefficients in MARA are interpreted as indication that a study feature or attribute changes the focal relationship — i. Subgroup analysis offers much more statistical power than MARA because confidence intervals are heavily influenced by T , the total number of observations across all studies , but it 1 often forces researchers to dichotomize continuous moderator variables e.

Sequentially isolated moderator tests involving correlated moderators can lead important interpretation errors unless there are enough studies i. MARA addresses these problems by simultaneously testing multiple continuous moderators, but it introduces new challenges in doing so Schmidt, Whereas subgroup analysis takes advantage of the statistical power gained by aggregating effects across many studies collectively grounded in thousands of observations typically , the significance of moderator coefficients i. Accordingly, the risks of Type I error due to sampling error is very high in MARA, and these risks grow when researchers use MARA to test many potential moderators simultaneously and without strong theoretical justification Schmidt, Three of these e.

In doing so, they capitalize on a central strength of MARA. Wang et al. They draw on governance substitution theory to investigate antecedents to CEO duality i. This theory argues that alternative means for controlling CEO behaviour substitute for one another such that when the board is independent, the board has ample human capital, and the board members are motivated by ownership, boards will allow CEO duality because it fosters unity of command and frees the CEO to take decisive action.

They also drew on theory about managerial discretion to theorize that substitution among alternative governance mechanisms matters most in countries where managers have greater discretion. Rosenbusch et al. From a methodological standpoint, Rosenbusch et al. Rather than contributing by using MARA to investigate how relationships change across countries, Schommer et al. It is unusual because they used the mean as the dependent variable in their MARA rather than a correlation between two variables.

Such an approach is used in medicine — e. Counterintuitively, however, they theorize and find that the negative effect of unrelated diversification on firm performance has been shrinking over time. Their theory is that less talented top management teams are abandoning the strategy, thereby increasing the proportion of skilled unrelated diversifiers in the population.

The advanced approaches summarized here facilitate new theorizing i. Reaping benefits from these approaches is increasingly important for advancing knowledge in top management journals see Shaw and Ertug, Habersang et al. Three studies i. Finally, Schommer et al. First, Geyskens et al. This no longer appears true. A second controversial issue that we encountered is that even though methodological treatments widely recognize that standardized or unstandardized regression coefficients i.

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Until recently, after we had put the special issue together, we were unaware of how big a problem this is. Roth et al. Although there are thoughtful approaches for estimating bivariate correlations from regression coefficients e.