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Null models-Effect size
fabro
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4-9-2008 6:49 PM
103 views
fabro
says:
nice explanation
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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/372f0c39-c7e8-40c1-a783-57fb6e90fbd7/1ACAECA5-1D09-41C9-A124-40FA4ABA3867/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.garyentsminger.com/biogeosim/biogeosimmain.htm" href="http://www.garyentsminger.com/biogeosim/biogeosimmain.htm" style="font-size: 11px;">www.garyentsminger.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.garyentsminger.com/biogeosim/biogeosimmain.htm"><P>The rationale for the standardized effect size follows directly from meta-analysis. In meta-analysis, a standardized comparison of experimental data is made between a "control" and a "treatment" group, with an estimate of the pooled variance for these treatments. Of course, in a null model analysis, there is no "experiment." However, we can think of the simulated matrices as a type of "control" for the effects of species interactions, and the observed matrix as the "treatment" that may show the effects of those interactions.</P></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;"> </td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/1ACAECA5-1D09-41C9-A124-40FA4ABA3867/blog/" title="blog or email this clip"><img src="http://content7.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>
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