Meta-Analysis Resources

Tools for Those Who Summarize the Evidence Base

Resources and networking for those who conduct or interpret meta-analyses related to any phenomenon that is gauged in multiple studies.

Gbelnerg Yamba
  • Boston, MA
  • United States
Share on Facebook Share on Facebook Share

Gbelnerg Yamba's Groups

Gbelnerg Yamba's Discussions

Funnel plot
4 Replies

Hi guys, I have 2 quick questions regarding estimation of publication bias in meta-analysis using the Funnel plot. 1. Regarding continuous variables where SMD are used, Do we run logES (logSMD)…Continue

Started this discussion. Last reply by ramesh athe Jun 27, 2012.

Including a 3 arm study
4 Replies

I have seen this question before, but I have a similar one and the answers here in the forum didn't help me much. I am trying to include a 3 arm study for meta-analysis .My intervention of interest…Continue

Started this discussion. Last reply by Gbelnerg Yamba Dec 8, 2011.

Gifts Received

Gift

Gbelnerg Yamba has not received any gifts yet

Give a Gift

 

Gbelnerg Yamba's Page

Latest Activity

ramesh athe replied to Gbelnerg Yamba's discussion Funnel plot
"Make it as two separate studies.......  "
Jun 27, 2012
ramesh athe replied to Gbelnerg Yamba's discussion Funnel plot
"It is better to use meta-regression with con founders...."
Mar 16, 2012
Gbelnerg Yamba replied to Gbelnerg Yamba's discussion Funnel plot
"Dear Blair, Thanks so much for walking me through the issue of dealing with repeated studies in a funnel plot. It is certainly helpful. I will see what additional inputs the publication bias group may have. Thanks a million."
Feb 20, 2012
Blair T. Johnson replied to Gbelnerg Yamba's discussion Funnel plot
"1. Funnel plots conventionally plot the weight (inverse SE or inverse variance) as the Y-variable and the effect size, SMD, as the X-variable. No logs are needed with SMD (it is the odds ratio that is routinely logged, not the SMD). Some platforms…"
Feb 20, 2012
Gbelnerg Yamba posted a discussion

Funnel plot

Hi guys, I have 2 quick questions regarding estimation of publication bias in meta-analysis using the Funnel plot. 1. Regarding continuous variables where SMD are used, Do we run logES (logSMD) against standard error (SE) of the effect size (ES/SMD) or it is logES against the log of the standard error (logSE) 2.  How do I handle studies that appear twice in the funnel plot? where an intervention of interest is compared with control and another active control, do I take the study as a single…See More
Feb 15, 2012
Gbelnerg Yamba posted a status
"Thanks William, I earlier tried getting CMA, and notice it only supports windows and no mac version. Thanks"
Feb 15, 2012
William L. Baker replied to Gbelnerg Yamba's discussion Calculating Standardized Mean Difference (SMD) or ES with confidence intervals included in the group Calculating Effect Sizes and Their Variances
"Gbeinerg,  I believe that the software package Comprehensive Meta-Analysis (www.meta-analysis.com) allows you to imput data in multiple formats.  As an example, if you have 4 studies with arm-level data (change +/- SD from baseline for…"
Feb 3, 2012
Gbelnerg Yamba added a discussion to the group Calculating Effect Sizes and Their Variances
Thumbnail

Calculating Standardized Mean Difference (SMD) or ES with confidence intervals included

Hi Guys, I have a nagging question. How do I compute Standardized Mean difference  (SMD)  (or the effect size or Cohen's d with Confidence Intervals included) from studies that only report between group difference and confidence intervals, without any datafor change, (mean +/-SD) from baseline. Given the change in (mean andSD) from baseline, I know meta-analyst softwares can generate either SMD of MDdepending on which metric u chose on the software.Summary of my question:Given only the "between…See More
Dec 8, 2011
Gbelnerg Yamba joined Blair T. Johnson's group
Thumbnail

Calculating Effect Sizes and Their Variances

Tips and techniques to help meta-analysts calculate effect sizes and the variances that are needed for the purpose of analysis.See More
Dec 8, 2011
Gbelnerg Yamba replied to Gbelnerg Yamba's discussion Including a 3 arm study
"Thanks  a million, Blair, will post it on the ES blog. THNX"
Dec 8, 2011
Blair T. Johnson replied to Gbelnerg Yamba's discussion Including a 3 arm study
"Sorry, I am no expert on meta-analyst software! Maybe someone else can help? You might think about posting your question in the effect size calculation group, which is dedicated to this purpose. -Blair"
Dec 8, 2011
Gbelnerg Yamba replied to Gbelnerg Yamba's discussion Including a 3 arm study
"Thanks Blair, I appreciate it. It was is helpful. I have one other questions which I urgently need suggestion with: How do I compute Standardized Mean difference  (SMD)  (or the effect size or Chens d with Confidence…"
Dec 8, 2011
Blair T. Johnson replied to Gbelnerg Yamba's discussion Including a 3 arm study
"If the report does not indicate what the sample sizes were for each cell, then it seems you have two alternatives: (a) make an assumption about the cells having equal size; or (b) contact the author(s) to ask. As to deciding what comparison is best,…"
Dec 8, 2011
Gbelnerg Yamba updated their profile
Nov 27, 2011
Gbelnerg Yamba posted a discussion

Including a 3 arm study

I have seen this question before, but I have a similar one and the answers here in the forum didn't help me much. I am trying to include a 3 arm study for meta-analysis .My intervention of interest lets say A was compared with placebo B, and another active intervention say C. How do I extract the sample size data for these?should it be A vs. (B/2 +C/2)? or should I concentrate on A vs. B and ignore intervention C?will appreciate your thoughtsSee More
Nov 27, 2011
Gbelnerg Yamba is now a member of Meta-Analysis Resources
Nov 27, 2011

Profile Information

Comment Wall

You need to be a member of Meta-Analysis Resources to add comments!

Join Meta-Analysis Resources

  • No comments yet!
 
 
 

© 2017   Created by Blair T. Johnson.   Powered by

Badges  |  Report an Issue  |  Terms of Service