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Child-Maltreatment-Research-L (CMRL) List Serve

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Welcome to the database of past Child-Maltreatment-Research-L (CMRL) list serve messages (10,000+). The table below contains all past CMRL messages (text only, no attachments) from Nov. 20, 1996 - September 14, 2018 and is updated quarterly.

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Message ID: 8186
Date: 2009-06-05

Author:Jill Levenson, Ph.D.

Subject:RE: how to calculate an effect size

Here is a very good website discussing in simple terms the basic concepts of power analysis. Cohen did provide guidelines for interpreting effect sizes for comparisons and correlations. I use GPower and find it to be very helpful. You can download it for free. Jill Levenson, Ph.D., LCSW Fort Lauderdale, FL From: bounce-3988070-6833436@list.cornell.edu [mailto:bounce-3988070-6833436@list.cornell.edu] On Behalf Of Todd McDonald Sent: Thursday, June 04, 2009 1:53 PM To: Child Maltreatment Researchers Subject: RE: how to calculate an effect size Dr. Koh Thank you for the web page. This seems to be limited to when you compare two means. Is that correct? What about when you have a logistic regression model? Should I just use the odds ratio as the effect size? TM --- On Wed, 6/3/09, Eun Koh wrote: From: Eun Koh Subject: RE: how to calculate an effect size To: "'Child Maltreatment Researchers'" Date: Wednesday, June 3, 2009, 5:16 PM I recently looked into the issue of effect size, and hopefully, this site will help: http://web.uccs.edu/lbecker/Psy590/es.htm It is noted in the above site, but again many people refer to Cohen's article when discussing the size (small, medium, large) of effect size: Cohen (1988). Statistical power analysis for the behavior sciences (second ed.). Hope this helps. Eun Eun Koh Postdoctoral Research Associate Children and Family Research Center School of Social Work University of Illinois at Urbana-Champaign Tel) 312-641-2505 (ext.18) E-mail) eunkoh@illinois.edu ________________________________ From: bounce-3984573-9402306@list.cornell.edu [mailto:bounce-3984573-9402306@list.cornell.edu] On Behalf Of Todd McDonald Sent: Wednesday, June 03, 2009 2:01 PM To: Child Maltreatment Researchers Cc: jmpolstra@att.net Subject: how to calculate an effect size I notice some of the journal articles use very large samples. Is there a way to calculate an effect size from a crosstabs table and a logistic regression table? Is there a rule on what is considered a big effect? TM

Here is a very good website discussing in simple terms the basic concepts of power analysis. Cohen did provide guidelines for interpreting effect sizes for comparisons and correlations. I use GPower and find it to be very helpful. You can download it for free. Jill Levenson, Ph.D., LCSW Fort Lauderdale, FL From: bounce-3988070-6833436list.cornell.edu [mailto:bounce-3988070-6833436list.cornell.edu] On Behalf Of Todd McDonald Sent: Thursday, June 04, 2009 1:53 PM To: Child Maltreatment Researchers Subject: RE: how to calculate an effect size Dr. Koh Thank you for the web page. This seems to be limited to when you compare two means. Is that correct? What about when you have a logistic regression model? Should I just use the odds ratio as the effect size? TM --- On Wed, 6/3/09, Eun Koh wrote: From: Eun Koh Subject: RE: how to calculate an effect size To: "'Child Maltreatment Researchers'" Date: Wednesday, June 3, 2009, 5:16 PM I recently looked into the issue of effect size, and hopefully, this site will help: http://web.uccs.edu/lbecker/Psy590/es.htm It is noted in the above site, but again many people refer to Cohen's article when discussing the size (small, medium, large) of effect size: Cohen (1988). Statistical power analysis for the behavior sciences (second ed.). Hope this helps. Eun Eun Koh Postdoctoral Research Associate Children and Family Research Center School of Social Work University of Illinois at Urbana-Champaign Tel) 312-641-2505 (ext.18) E-mail) eunkohillinois.edu ________________________________ From: bounce-3984573-9402306list.cornell.edu [mailto:bounce-3984573-9402306list.cornell.edu] On Behalf Of Todd McDonald Sent: Wednesday, June 03, 2009 2:01 PM To: Child Maltreatment Researchers Cc: jmpolstraatt.net Subject: how to calculate an effect size I notice some of the journal articles use very large samples. Is there a way to calculate an effect size from a crosstabs table and a logistic regression table? Is there a rule on what is considered a big effect? TM