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Specifically, defendants argue that Dr. Hakala 1) studies the wrong days, 2) overuses so-called "dummy variables," 3) disregards prior disclosures and 4) fails to control for confounding factors.
Further undermining the validity of the empirical analysis, the article acknowledges but fails to control for the fact that 47% of the activist targets in the dataset cease to survive as independent companies throughout the measurement period.
First set: Williams* 1-0 ShAndpova And Williams takes the two points needed to tie up her first service game with no trouble - with a booming flat serve that Sharapova fails to control for the first point then a mistake by Sharapova on the second - the Russian belting a vicious forehand long after a short rally.
In recent research, Dube et al. (Rev Econ Stat 92 945-964, 2010) and Allegretto et al. (Ind Relat 50 205-240, 2011) argue that past U.S. research is flawed because it does not restrict comparison areas to those that are geographically proximate and fails to control for changes in low-skill labor markets that are correlated with minimum wage increases.
However, their regression analysis fails to control for variables that one would expect are important predictors of HIV/AIDS prevalence, such as sexual behaviour and attitudes, and knowledge about the transmission of the disease.
Consequently, this design fails to control for volunteer bias, leaving open the possibility that positive outcomes resulting from program participation may be due to the highly motivated nature of students who elect to participate in the program, rather than to the effects of the program itself.
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Existing studies find support for this hypothesis because they fail to control for the presence of omitted variables.
But those studies, Mr. Schwartz writes, either failed to control for contaminating factors or were not supported by later research.
In addition, all previous studies involved multiple operating surgeons and failed to control for variation in surgeon expertise.
He argues that these studies are flawed because they fail to control for other factors, such as pre-existing psychological complaints or other drug use.
Although removal of CVCs has been advocated as an adjunctive strategy for treating patients with candidaemia, most studies have failed to control for important variables, e.g., the severity of illness and persistence of neutropenia.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com