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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.
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ramesh athe replied to Gbelnerg Yamba's discussion Funnel plot"It is better to use meta-regression with con founders...."
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."
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…"
Gbelnerg Yamba posted a discussionFunnel 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
Gbelnerg Yamba posted a status"Thanks William, I earlier tried getting CMA, and notice it only supports windows and no mac version. Thanks"
"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…"
Gbelnerg Yamba added a discussion to the group Calculating Effect Sizes and Their Variances
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
Gbelnerg Yamba joined Blair T. Johnson's groupCalculating 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
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"
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"
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…"
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,…"
Gbelnerg Yamba posted a discussionIncluding 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
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