What is qca

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Sign in with your library card Please enter your library card number. If you think you should have access to this title, please contact your librarian. All rights reserved. Powered by: Safari Books Online. Qualitative comparative analysis. Thanks very much for sharing this on the site - it's great to see the development of this tool. Now that it's available to everyone, I'd love to add this to our resource library where it can be found in searches and linked to relevant pages - Would you be able to fill out a resource recommendation so that I can do this?

You can do this via this webform , or you can use the Contact Us field at the bottom of the screen to do this via email. Login Login and comment as BetterEvaluation member or simply fill out the fields below. In the example above, there are two different causal configurations, each made up of two conditions.

Equifinality, where there is more than one way in which an outcome can happen. In the above example, each additional configuration represents a different causal pathway Causal conditions which are necessary, sufficient, both or neither, plus more complex combinations known as INUS causes — insufficient but necessary parts of a configuration that is unnecessary but sufficient , which tend to be more common in everyday life. In the example above, no one condition was sufficient or necessary.

But each condition is an INUS type cause Asymmetric causes — where the causes of failure may not simply be the absence of the cause of success. The relative influence of different individual conditions and causal configurations in a set of cases being examined. In the example above, the first configuration may have been associated with 10 cases where the outcome was E, whereas the second might have been associated with only 5 cases.

Configurations can be evaluated in terms of coverage the percentage of cases they explain and consistency the extent to which a configuration is always associated with a given outcome. This slide show from Charles C Ragin, provides a detailed explanation, including examples, that clearly demonstrates the question, 'What is QCA? Mello focuses on reviewing current applications for use in Qualitative Comparative Analysis QCA in order to take stock of what is available and highlight best practice in this area.

Sources Marshall, G. Understand Causes. Check the results support causal attribution. A special thanks to this page's contributors. A conventional or "crisp" set is dichotomous: An case is either "in" or "out" of a set, for example, the set of Protestants. Thus, a conventional set is comparable to a binary variable with two values, 1 "in," i. A fuzzy set, by contrast, permits membership in the interval between 0 and 1 while retaining the two qualitative states of full membership and full non-membership.

It is up to the researcher to specify procedures for assigning fuzzy membership scores to cases, and these procedures must be both open and explicit so that they can be evaluated by other scholars.