meta-analysis

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meta-analysis

a method by which the results of a number of quantitative studies can be analysed together to produce an overall impression from a field of research. This method lays emphasis on EFFECT SIZE as well as providing a SIGNIFICANCE TEST for the results. It has advantages over a conventional review in that it forces the analyst to evaluate the method and the results of a study more critically and that it provides an objective method for synthesizing the results from such studies. There are two basic approaches to meta-analysis. The first and most common approach involves combining the results from the studies in order to produce a single effect size, inferential statistic and probability. The second approach involves comparing studies which differ over some aspect of their method to see if the results of studies which utilized one design or measure differ from the results of studies employing a different design or method. By combining the results of a number of studies, meta-analysis can circumvent the problems of low STATISTICAL POWER which may characterize the individual studies. (See Cooper; 1998; Cooper and Hedges, 1994; Rosenthal, 1991)
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One metastudy found that two ACL-injury-prevention regimens were effective: Sportsmetrics promotes leg and core strength, increases vertical jump height and may improve speed and agility; the Prevent Injury and Enhance Performance, or PEP, program, makes a big difference in the flexion strength of the knee.
Mental disturbance or illness in the parent was also found to be a factor in their 2007 metastudy of filicide, the catchall term used more generally to describe child-murder by a parent who is not suffering from hormonally-induced psychological imbalance (Bourget et al.
The same study (really a metastudy looking at other studies on motion) points out that motion may have different values depending on the background and skills of the pilot.
Becoming a nurse: a metastudy of early professional socialization and career choice in nursing.
Keywords: metastudy, publication patterns, author characteristics, article characteristics
A recent European metastudy of 90 other studies concluded that only one-fifth of the world's energy demand could likely be met by biofuels without removing meat from the human diet or making massive land use changes beyond the 296 million acres which already must be put into cultivation to feed the population of 2050.
Systematic reviews of bladder training and voiding programmes in adults: a synopsis of findings on theory and methods using metastudy techniques.
The Study: Scottish researchers conducted a metastudy where they reviewed the results published from 1990 to 2011 of studies on preventing recurrent infections.
This is the first comprehensive metastudy of JHCEAD undertaken and involves the years 1994-2009.
See also the metastudy by de Mooij and Ederveen, "Corporate Tax Elasticities," p.
This is the first JEC metastudy ever undertaken and involves the years 1994 through 2009.
The main outcome of this investigation corresponds with the conclusions of the Russel (1999) metastudy for media-supported instruction.