In this meta-analysis (https://www.ncbi.nlm.nih.gov/pubmed/30475963) it seems that for instance in figure 2 for lean body mass improvements individual studies did not find significant better results with protein supplementation compared to no protein supplementation (since the...
I have a question on what meta-analysis is best when aggregating means using non-randomized longitudinal data with a control group that significantly differs from the active group at baseline.
The outcome in question is depression, and the question is whether depression scores soar or fall in...
for my thesis I would like to conduct a meta-analysis with the aim to summarize the findings about the effectiveness of a political measure. The corresponding studies compare countries in which the measure was implemented with countries in which it was not implemented and calculate...
I wonder if you might be able to help with testing for heterogeneity (Cochran's q or I-squred) in meta-analysing genotypic odds ratios in two groups from two different genetic associations studies of the same phenotype. (This question pertains to genetics, but the principle, I believe, is...
Hello, anyone out there familiar with Trial Sequential Analysis (TSA) software developed by Copenhagen Trial Unit?
The free software is available at: http://www.ctu.dk/tsa/downloads.aspx
Manual is available here: http://www.ctu.dk/tsa/files/tsa_manual.pdf
Summary of my questions up here:
I am conducting a meta analysis of pearsons r correlations but I have a study with a spearmans rank correlation. I was converting the pearsons correlations into fishers z scores to conduct the meta analysis , then to be converted back into correlations, but I am wondering if I am able to...
I was wondering if someone can help me with a meta-analysis using revman 5.3. I would like to switch from quadas to quadas2 but this link seems to be missing from the General tab. Has anyone had the same problem?
I am doing a meta-analysis in which I am comparing 3 outcomes measures across multiple studies:
(1) Cronbach's alpha
(2) Kappa coefficient or Interclass correlation coefficient (depending on which study chose what measure)
(3) Spearman Rank Correlation coefficient or Pearson correlation...
I had a question about how to calculate Cohen's D a particular situation for my meta-analysis. I am a first year grad student, so my familiarity with statistics is somewhat limited!
The study design - participants are assigned to one of two groups (parallel design), but not a true RCT because...
I have extracted data from longitudinal studies that have collected data on pre and post time points. All studies have same time period.
So I have got
In order to compute the standardised or unstandardised Mean...
Hey, I'm new to R and currently trying to teach myself how to use it with various guides.
Problem is, none of the guides cover the scenario I'm dealing with, they all assume that for a meta-analysis you have outcome data for both the control and treatment groups.
I would like to use the...
I have data from 200 similar studies, all measuring the same effect of a continuous independent variable on the same continuous response. I say similar because the designs are different (split plot vs. rcbd) and the levels of the independent variable is not the same across all studies.
I am currently working on my Master thesis on moderators and mediators for the effectiveness of cross-cultural training (CCT). I am actually writing a literature review, but want to end my thesis by judging to what extent the included studies could also be compared...
I'm completing a systematic review and performing meta-anlaysis forest plots. The research question related to the finding of risk factors for a complication of diabetes. There are therefore many different risk factors and often there are only three papers with similar...
I am quite familiar with mixed effects (multilevel models) in meta analyses.
Now, I want to do a mixed effects (multilevel) meta analysis structural equation model (MASEM) with STATA and the gsem package because my data format is long.
My data look like:
Hi. Is there some good hands-on tutorial about running MCMC analysis for the meta-analysis of diagnostic tests? Is it inbuilt STATA Bayesian analysis is sufficient for this task or is necessary to install some additional patch?
I am trying to figure out the best way to calculate an effect size for a single-group design when I do not know the pair-wise correlation or standard deviation for the difference scores. I have received mixed messages as to whether or not I can use the formula for independent measures...
I'm proposing to evaluate an outcome in three completed randomized controlled trials. The primary goal is to analyze a new outcome in each data set separately (i.e., 3 separate papers). A secondary aim is to compare across the three trials to see which intervention type was most effective...
I'm conducting a meta-analysis, and some papers have 2 or 3 intervention groups in addition to the control.
I read that I should possibly split the control group equally and examine as separate outcomes.
Also, would it be as simple as splitting the control equally, and...
Hi, I'm new to meta-analyses and revman and would really appreciate your help!
I have data from an article I wish to add to revman.
They have given an adjusted odds ratio, percentages of the event, and the total number of participants in each group.
I thought that if I had the...