http://www.sciencebase.com/science-blog/bad-apples-colds-and-echinacea.html Science Blog from Freelance Science Writer David Bradley Thu, 09 Feb 2012 08:25:37 +0000 hourly 1 http://wordpress.org/?v=3.3.1 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.”

]]>