search for: wvbauer

Hi I'm conducing a meta-analysis using the meta package. Here's a bit of code that works fine - tmp <- metacont(samplesize.2, pctdropout.2, sddropout.2, samplesize.1, pctdropout.1, sddropout.1, data=Dataset, sm="WMD") I would now like to control for a couple of variables (continuous and categorical) that aren't in the equation. Is meta

...Wolfgang Viechtbauer, Ph.D., Statistician Department of Psychiatry and Psychology School for Mental Health and Neuroscience Faculty of Health, Medicine, and Life Sciences Maastricht University, P.O. Box 616 (VIJV1) 6200 MD Maastricht, The Netherlands +31 (43) 388-4170 | http://www.wvbauer.com

Hi, I have been looking for an R package which allowed to do meta-analysis (both pairwise and network/mixed-treatment) at arm-level rather than at trial-level, the latter being the common way in which meta-analysis is done. By arm-level meta-analysis I mean one that accounts for data provided at the level of the individual arms of each trial and that does not simply derive the difference between

Hi, I am running R 2.12.0 (windows). example(txtProgressBar) gives me some funny screen output with all kinds of special characters appearing and disappearing. It's happening on two different mashines since vs. 2.12.0. Is this a known issue? Best, Jalla -- View this message in context: http://r.789695.n4.nabble.com/txtProgressBar-strange-behavior-in-R-2-12-0-tp3051976p3051976.html Sent

...edataframe and if dosomething(somevariable) is called, the function should find somevariable in the parent frame (or anywhere else in the search path)? Thanks for any help! -- Wolfgang Viechtbauer ?Department of Methodology and Statistics ?University of Maastricht, The Netherlands ?http://www.wvbauer.com/

...d arguments to the method call, but just ignore some/all of them in whatever is being done inside of the method function. Are there any other options? Is there some recommended practice for this? Thanks in advance for any feedback! Best, -- Wolfgang Viechtbauer http://www.wvbauer.com/ Department of Methodology and Statistics Tel: +31 (43) 388-2277 School for Public Health and Primary Care Office Location: Maastricht University, P.O. Box 616 Room B2.01 (second floor) 6200 MD Maastricht, The Netherlands Debyeplein 1 (Randwyck)

...Wolfgang Viechtbauer, Ph.D., Statistician Department of Psychiatry and Psychology School for Mental Health and Neuroscience Faculty of Health, Medicine, and Life Sciences Maastricht University, P.O. Box 616 (VIJV1) 6200 MD Maastricht, The Netherlands +31 (43) 388-4170 | http://www.wvbauer.com

Dear all, We are trying to do a meta regression in R using the lme function. The reason for doing this with lme function is that we have covariates and studies within references. In S-Plus this is possible by using the following command: lme(outcome ~ covars, random = ~1 | reference/study, weights = varFixed(~var.outcome), data = mydata, control = lmeControl(sigma = 1)) This means that the

Dear Wolfgang Viechtbauer and list members: I have discovered your "MiMa" function for fitting meta-analytic mixed-effects models through an earlier discussion on this list. I think it is extremely useful and fills an important gap. In particular, since it is programmed so transparently, it is easy to adapt it for one's own needs. (For example, I have found it easy to identify

...2:8.38-3.1 Any suggestions on what else I may need? Best, Wolfgang -- Wolfgang Viechtbauer, Ph.D., Statistician | Department of Psychiatry and Neuropsychology | Maastricht University | P.O. Box 616 (VIJV1) | 6200 MD Maastricht, The Netherlands | +31 (43) 388-4170 | http://www.wvbauer.com

Hello all, I am using forest.rma to plot a random effects model meta-analysis. I noticed that refline sets a vertical line indicating the null hypothesis. Is there a way to draw another vertical line, possibly dashed, centered on the summary estimate? Prof. Viechtbauer, if you happen to read this, I'd like to thank you for making an excellent package. I have been using the metafor package

...of bootstrap t-values that are more extreme on either side of the bootstrap distribution than the actual t-value observed? Any suggestions or comments would be appreciated! -- Wolfgang Viechtbauer Department of Methodology and Statistics University of Maastricht, The Netherlands http://www.wvbauer.com

Dear colleagues, I'm conducting a meta-analysis of studies evaluating adherence of HIV-positive drug users into AIDS treatment, therefore I'm looking for some advice and syntax suggestion for running the meta-regression using proportions, not the usual OR/RR frequently used on RCT studies. Have already searched already several handbooks, R-manuals, mailing lists, professors, but... not

...Wolfgang Viechtbauer, Ph.D., Statistician Department of Psychiatry and Psychology School for Mental Health and Neuroscience Faculty of Health, Medicine, and Life Sciences Maastricht University, P.O. Box 616 (VIJV1) 6200 MD Maastricht, The Netherlands +31 (43) 388-4170 | http://www.wvbauer.com > -----Original Message----- > From: Dushanthi Pinnaduwage [mailto:dushanthi at bell.net] > Sent: Tuesday, July 31, 2012 16:40 > To: wvb at metafor-project.org; Dushanthi Pinnaduwage > Subject: "metafor" package, proportions: single groups wrt to a > categorical...

R Experts: I am conducting a meta-analysis where the effect measures to be pooled are simple proportions. For example, consider this data from Fleiss/Levin/Paik's Statistical methods for rates and proportions (2003, p189) on smokers: Study N Event P(Event) 1 86 83 0.965 2 93 90 0.968 3 136 129 0.949 4 82 70 0.854 Total

...quot; to become a regular user again and you should be able to start R by just typing R. You may also remove the line you added under (12) from the sources.list file. Best, -- Wolfgang Viechtbauer ?Department of Methodology and Statistics ?University of Maastricht, The Netherlands ?http://www.wvbauer.com/

...tring R version 2.7.2 (2008-08-25) VW> Can anybody help figure out what causes this problem? VW> Best, VW> -- VW> Wolfgang Viechtbauer VW> ?Department of Methodology and Statistics VW> ?University of Maastricht, The Netherlands VW> ?http://www.wvbauer.com/ VW> _______________________________________________ VW> R-sig-mixed-models at r-project.org mailing list VW> https://stat.ethz.ch/mailman/listinfo/r-sig-mixed-models

Dear R Users, My question is overall and not necessarily related to R. Suppose we face to a situation in which MSE( Mean Squared Error) shows desired results but Bias shows undesired ones, Or in advers. How can we evaluate the results. And suppose, Both MSE and Bias are important for us. The ecact question is that, whether there is any combined measure of two above metrics. Thank you so

Dear R users, how can I test, whether two correlations differ significantly. (I want to prove, that variables are correlated differently, depending on the group a person is in.) Greetings from Freiburg im Breisgau (Germany), Timo Stolz

...package also provides various plot functions (for example, for forest, funnel, and radial plots) and functions for assessing the model fit and obtaining case diagnostics. Best, -- Wolfgang Viechtbauer Department of Methodology and Statistics University of Maastricht, The Netherlands http://www.wvbauer.com/