[R] metafor escalc(measure=SMCC)
Many thanks to Wolfgang Wiechtbauer for the explanation. Sincerely Mario Petretta Message: 31 Date: Thu, 21 Nov 2013 19:08:14 +0100 From: Viechtbauer Wolfgang (STAT) wolfgang.viechtba...@maastrichtuniversity.nl To: petre...@unina.it petre...@unina.it, r-help@r-project.org r-help@r-project.org Subject: Re: [R] metafor escalc(measure=SMCC) Message-ID: 077e31a57da26e46ab0d493c9966ac730d99255...@um-mail4112.unimaas.nl Content-Type: text/plain; charset=us-ascii .cmicalc is a non-exported function. You can see the code with: getAnywhere(.cmicalc) Best, Wolfgang [Nascondi Testo quotato] -Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of petre...@unina.it Sent: Thursday, November 21, 2013 13:39 To: r-help@r-project.org Subject: [R] metafor escalc(measure=SMCC) Many thanks to Wolfgang Viechtbauer for the prompt and clear answer. However, I'm unable to understand what .cmicalc mathematically does in the code line: cmi - .cmicalc(mi) I look in the metafor documentation and in R (?.cmical and ??.cmicalc) but I have no result. Please, can I have further explanation on this point? Sorry for the trouble Sincerely Mario Petretta Department of Translational Medical Sciences Naples University Federico II Italy Message: 50 Date: Tue, 19 Nov 2013 11:48:33 +0100 From: Viechtbauer Wolfgang (STAT) wolfgang.viechtba...@maastrichtuniversity.nl To: petre...@unina.it petre...@unina.it, r-help@r-project.org r-help@r-project.org Subject: Re: [R] metafor escalc(measure=SMCC) Message-ID: 077E31A57DA26E46AB0D493C9966AC730D9925568A@UM- MAIL4112.unimaas.nl Content-Type: text/plain; charset=us-ascii Dear Mario, You can always just inspect the code: escalc.default Best, Wolfgang -- 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: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of petre...@unina.it Sent: Tuesday, November 19, 2013 11:29 To: r-help@r-project.org Subject: [R] metafor escalc(measure=SMCC) Dear all, I use R 3.0 for Windows. I ask how escalc(measure=SMCC) [metafor package] mathematically calculate yi and vi when only change score and SD change score are provided. I used the example (repoted below) posted by Qiang Yue at: http://r.789695.n4.nabble.com/using-metafor-for-meta-analysis-of-before- after-studies-escalc-SMCC-td4667233.html but it is unclear for me the formula used to derive y1 and v1. I read the documentation of metafor package and it is all very well described, but I ask if possible for the formula used by escalc(measure=SMCC) to mathematically calculate yi and vi. Unfortunatel, I have no free access to the paper quoted in metafor package. Beginning example: fMRS author year n mean_r sd_r mean_s sd_s r 1 Tom 2006 9 0 0 0.12 0.030 0 2 Jack 2012 6 0 0 0.23 0.050 0 3 Zhu 2013 8 0 0 0.18 0.050 0 dat_SMCC=escalc(measure=SMCC,data=fMRS,ni=n,m1i=mean_s,m2i=mean_r,sd1i=s d_s,sd2i=sd_r,ri=r ,append=TRUE) dat_SMCC author year n mean_r sd_r mean_s sd_s r yi vi 1 Tom 2006 9 0 00.12 0.03 0 3.6108 0.8354 2 Jack 2012 6 0 00.23 0.05 0 3.8674 1.4131 3 Zhu 2013 8 0 00.18 0.05 0 3.1975 0.7640 Sincerely -- Mario Petretta Department of Translational Medical Sciences Naples University Federico II Italy __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting- guide.html and provide commented, minimal, self-contained, reproducible code. -- Mario Petretta Department of Translational Medical Sciences Naples University Federico II Italy __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] metafor escalc(measure=SMCC)
Many thanks to Wolfgang Viechtbauer for the prompt and clear answer. However, I'm unable to understand what .cmicalc mathematically does in the code line: cmi - .cmicalc(mi) I look in the metafor documentation and in R (?.cmical and ??.cmicalc) but I have no result. Please, can I have further explanation on this point? Sorry for the trouble Sincerely Mario Petretta Department of Translational Medical Sciences Naples University Federico II Italy Message: 50 Date: Tue, 19 Nov 2013 11:48:33 +0100 From: Viechtbauer Wolfgang (STAT) wolfgang.viechtba...@maastrichtuniversity.nl To: petre...@unina.it petre...@unina.it, r-help@r-project.org r-help@r-project.org Subject: Re: [R] metafor escalc(measure=SMCC) Message-ID: 077e31a57da26e46ab0d493c9966ac730d99255...@um-mail4112.unimaas.nl Content-Type: text/plain; charset=us-ascii Dear Mario, You can always just inspect the code: escalc.default Best, Wolfgang -- 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: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of petre...@unina.it Sent: Tuesday, November 19, 2013 11:29 To: r-help@r-project.org Subject: [R] metafor escalc(measure=SMCC) Dear all, I use R 3.0 for Windows. I ask how escalc(measure=SMCC) [metafor package] mathematically calculate yi and vi when only change score and SD change score are provided. I used the example (repoted below) posted by Qiang Yue at: http://r.789695.n4.nabble.com/using-metafor-for-meta-analysis-of-before- after-studies-escalc-SMCC-td4667233.html but it is unclear for me the formula used to derive y1 and v1. I read the documentation of metafor package and it is all very well described, but I ask if possible for the formula used by escalc(measure=SMCC) to mathematically calculate yi and vi. Unfortunatel, I have no free access to the paper quoted in metafor package. Beginning example: fMRS author year n mean_r sd_r mean_s sd_s r 1 Tom 2006 9 0 0 0.12 0.030 0 2 Jack 2012 6 0 0 0.23 0.050 0 3 Zhu 2013 8 0 0 0.18 0.050 0 dat_SMCC=escalc(measure=SMCC,data=fMRS,ni=n,m1i=mean_s,m2i=mean_r,sd1i=s d_s,sd2i=sd_r,ri=r ,append=TRUE) dat_SMCC author year n mean_r sd_r mean_s sd_s r yi vi 1 Tom 2006 9 0 00.12 0.03 0 3.6108 0.8354 2 Jack 2012 6 0 00.23 0.05 0 3.8674 1.4131 3 Zhu 2013 8 0 00.18 0.05 0 3.1975 0.7640 Sincerely -- Mario Petretta Department of Translational Medical Sciences Naples University Federico II Italy __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] metafor escalc(measure=SMCC)
.cmicalc is a non-exported function. You can see the code with: getAnywhere(.cmicalc) Best, Wolfgang -Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of petre...@unina.it Sent: Thursday, November 21, 2013 13:39 To: r-help@r-project.org Subject: [R] metafor escalc(measure=SMCC) Many thanks to Wolfgang Viechtbauer for the prompt and clear answer. However, I'm unable to understand what .cmicalc mathematically does in the code line: cmi - .cmicalc(mi) I look in the metafor documentation and in R (?.cmical and ??.cmicalc) but I have no result. Please, can I have further explanation on this point? Sorry for the trouble Sincerely Mario Petretta Department of Translational Medical Sciences Naples University Federico II Italy Message: 50 Date: Tue, 19 Nov 2013 11:48:33 +0100 From: Viechtbauer Wolfgang (STAT) wolfgang.viechtba...@maastrichtuniversity.nl To: petre...@unina.it petre...@unina.it, r-help@r-project.org r-help@r-project.org Subject: Re: [R] metafor escalc(measure=SMCC) Message-ID: 077E31A57DA26E46AB0D493C9966AC730D9925568A@UM- MAIL4112.unimaas.nl Content-Type: text/plain; charset=us-ascii Dear Mario, You can always just inspect the code: escalc.default Best, Wolfgang -- 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: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of petre...@unina.it Sent: Tuesday, November 19, 2013 11:29 To: r-help@r-project.org Subject: [R] metafor escalc(measure=SMCC) Dear all, I use R 3.0 for Windows. I ask how escalc(measure=SMCC) [metafor package] mathematically calculate yi and vi when only change score and SD change score are provided. I used the example (repoted below) posted by Qiang Yue at: http://r.789695.n4.nabble.com/using-metafor-for-meta-analysis-of-before- after-studies-escalc-SMCC-td4667233.html but it is unclear for me the formula used to derive y1 and v1. I read the documentation of metafor package and it is all very well described, but I ask if possible for the formula used by escalc(measure=SMCC) to mathematically calculate yi and vi. Unfortunatel, I have no free access to the paper quoted in metafor package. Beginning example: fMRS author year n mean_r sd_r mean_s sd_s r 1 Tom 2006 9 0 0 0.12 0.030 0 2 Jack 2012 6 0 0 0.23 0.050 0 3 Zhu 2013 8 0 0 0.18 0.050 0 dat_SMCC=escalc(measure=SMCC,data=fMRS,ni=n,m1i=mean_s,m2i=mean_r,sd1i=s d_s,sd2i=sd_r,ri=r ,append=TRUE) dat_SMCC author year n mean_r sd_r mean_s sd_s r yi vi 1 Tom 2006 9 0 00.12 0.03 0 3.6108 0.8354 2 Jack 2012 6 0 00.23 0.05 0 3.8674 1.4131 3 Zhu 2013 8 0 00.18 0.05 0 3.1975 0.7640 Sincerely -- Mario Petretta Department of Translational Medical Sciences Naples University Federico II Italy __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting- guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] metafor escalc(measure=SMCC)
Dear all, I use R 3.0 for Windows. I ask how escalc(measure=SMCC) [metafor package] mathematically calculate yi and vi when only change score and SD change score are provided. I used the example (repoted below) posted by Qiang Yue at: http://r.789695.n4.nabble.com/using-metafor-for-meta-analysis-of-before-after-studies-escalc-SMCC-td4667233.html but it is unclear for me the formula used to derive y1 and v1. I read the documentation of metafor package and it is all very well described, but I ask if possible for the formula used by escalc(measure=SMCC) to mathematically calculate yi and vi. Unfortunatel, I have no free access to the paper quoted in metafor package. Beginning example: fMRS author year n mean_r sd_r mean_s sd_s r 1 Tom 2006 9 0 0 0.12 0.030 0 2 Jack 2012 6 0 0 0.23 0.050 0 3 Zhu 2013 8 0 0 0.18 0.050 0 dat_SMCC=escalc(measure=SMCC,data=fMRS,ni=n,m1i=mean_s,m2i=mean_r,sd1i=sd_s,sd2i=sd_r,ri=r ,append=TRUE) dat_SMCC author year n mean_r sd_r mean_s sd_s r yi vi 1 Tom 2006 9 0 00.12 0.03 0 3.6108 0.8354 2 Jack 2012 6 0 00.23 0.05 0 3.8674 1.4131 3 Zhu 2013 8 0 00.18 0.05 0 3.1975 0.7640 Sincerely -- Mario Petretta Department of Translational Medical Sciences Naples University Federico II Italy __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] metafor escalc(measure=SMCC)
Dear Mario, You can always just inspect the code: escalc.default Best, Wolfgang -- 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: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of petre...@unina.it Sent: Tuesday, November 19, 2013 11:29 To: r-help@r-project.org Subject: [R] metafor escalc(measure=SMCC) Dear all, I use R 3.0 for Windows. I ask how escalc(measure=SMCC) [metafor package] mathematically calculate yi and vi when only change score and SD change score are provided. I used the example (repoted below) posted by Qiang Yue at: http://r.789695.n4.nabble.com/using-metafor-for-meta-analysis-of-before- after-studies-escalc-SMCC-td4667233.html but it is unclear for me the formula used to derive y1 and v1. I read the documentation of metafor package and it is all very well described, but I ask if possible for the formula used by escalc(measure=SMCC) to mathematically calculate yi and vi. Unfortunatel, I have no free access to the paper quoted in metafor package. Beginning example: fMRS author year n mean_r sd_r mean_s sd_s r 1 Tom 2006 9 0 0 0.12 0.030 0 2 Jack 2012 6 0 0 0.23 0.050 0 3 Zhu 2013 8 0 0 0.18 0.050 0 dat_SMCC=escalc(measure=SMCC,data=fMRS,ni=n,m1i=mean_s,m2i=mean_r,sd1i=s d_s,sd2i=sd_r,ri=r ,append=TRUE) dat_SMCC author year n mean_r sd_r mean_s sd_s r yi vi 1 Tom 2006 9 0 00.12 0.03 0 3.6108 0.8354 2 Jack 2012 6 0 00.23 0.05 0 3.8674 1.4131 3 Zhu 2013 8 0 00.18 0.05 0 3.1975 0.7640 Sincerely -- Mario Petretta Department of Translational Medical Sciences Naples University Federico II Italy __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting- guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
