http://www.sciencebase.com/science-blog/bad-apples-colds-and-echinacea.html Science Blog from Freelance Science Writer David Bradley Sat, 07 Nov 2009 00:41:44 +0000 http://wordpress.org/?v=2.8.5 hourly 1 http://www.sciencebase.com/science-blog/bad-apples-colds-and-echinacea.html/comment-page-1#comment-120122 Hsien Lei Sat, 30 Jun 2007 09:12:48 +0000 http://www.sciencebase.com/science-blog/bad-apples-colds-and-echinacea.html#comment-120122 Meta-analyses have their time and place esp. to boost sample size and consequently the power of the study to detect differences. In the case of echinacea, however, so many uncontrolled variables certainly could taint the "barrel." Meta-analyses have their time and place esp. to boost sample size and consequently the power of the study to detect differences. In the case of echinacea, however, so many uncontrolled variables certainly could taint the “barrel.”

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