[R] p-value of the pooled Z score

Hello, I have to compute the pooled z-value and I would like to know which way is more appropriate b - c( -0.205,1.040,0.087) s - c(0.449,0.167,0.241) n - c(310, 342, 348) z - b/s Z - sum(z)/sqrt(length(n)) P - 2*(1-pnorm(abs(Z))) P w - sqrt(n) Zw - sum(w * z)/sqrt(sum(w^2)) Pw - 1 -

Re: [R] metaplot

6200 MD Maastricht, The Netherlands Tel: +31 (43) 368-5248 Fax: +31 (43) 368-8689 Web: http://www.wvbauer.com From: r-help-boun...@r-project.org [r-help-boun...@r-project.org] On Behalf Of cheba meier [cheba.me...@googlemail.com] Sent: Thursday, April

Re: [R] metaplot

and Neuropsychology School for Mental Health and Neuroscience Maastricht University, P.O. Box 616 6200 MD Maastricht, The Netherlands Tel: +31 (43) 368-5248 Fax: +31 (43) 368-8689 Web: http://www.wvbauer.com -- *From:* cheba meier [cheba.me...@googlemail.com

Re: [R] metaplot

I installed R 2.12 and it works now, thank you Wolfgang. Servus Cheba library(metafor) Error: This is R 2.11.0, package 'metafor' needs = 2.12.0 2011/4/8 cheba meier cheba.me...@googlemail.com I have just installed the package as install.packages(metafor) --- Please select a CRAN mirror

Re: [R] metaplot

: limits - aes(ymax = OR + (OR - 95%LCI), ymin = OR - (OR - 95%LCI)) ggplot(dataframe, aes(x = Study.Name, y = OR)) + geom_point() + geom_errobar(limits) Best, Scott On Wednesday, April 6, 2011 at 11:53 AM, cheba meier wrote: Dear all, I have a four variable: Stuy.Name, OR, 95%LCI and 95%UCI

[R] metaplot

Dear all, I have a four variable: Stuy.Name, OR, 95%LCI and 95%UCI and I would like to create a meta analysis plot. I can't use meta.MH function in metaplot because I do not have n.trt, n.ctrl, col.trt, col.ctrl are not available! Is there an alternative way to do it? Many thanks in advance,

[R] two group cox model

Dear all, I am doing library(survival) fit - coxph(Surv(futime,fustat) ~ rx, ovarian) plot(survfit(fit,newdata=ovarian),col=c(1,2)) legend(bottomleft, legend=c(rx = 0, rx = 1), lty=c(1,2),col=c(1,2)) Is this correct to compare these two groups? Is the 0.31 the p-value that the median f

[R] by group testing

Hello, I have a data set which is similar to the following data mice - rep(letters[1:4],10) outcome - sample(c(0,1),length(mice),replace=T) group - c(rep(A,length(mice)/2),rep(B,length(mice)/2)) my.data - data.frame(mice,outcome,group) my.sort.data - my.data[order(my.data[,1]),] I would like

Re: [R] plotmeans

of both plots...) HTH Jannis cheba meier schrieb: Hello, I am using library(gplots) to do something like data(state) x1 - state.area/1 x2 - x1+round((rnorm(length(state.area),3,3))) plotmeans(x1 ~ state.region) Is it possible to plot x2 to x1 in the same graph, something

[R] plotmeans

Hello, I am using library(gplots) to do something like data(state) x1 - state.area/1 x2 - x1+round((rnorm(length(state.area),3,3))) plotmeans(x1 ~ state.region) Is it possible to plot x2 to x1 in the same graph, something like: linesmeans(x2 ~ state.region) Best wishes, Cheba

Re: [R] median of two groups

Ph.D. Statistical Data Center Intermountain Healthcare greg.s...@imail.org 801.408.8111 -Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r- project.org] On Behalf Of cheba meier Sent: Monday, May 10, 2010 3:02 AM To: Bert Gunter Cc: R-help@r

Re: [R] median of two groups

- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of cheba meier Sent: Friday, May 07, 2010 12:46 PM To: Joris Meys Cc: R-help@r-project.org; Thomas Lumley Subject: Re: [R] median of two groups Hi all, Thank you for your reply. if done properly! What does

Re: [R] median of two groups

samples. median.test-function(x,y){ z-c(x,y) g - rep(1:2, c(length(x),length(y))) m-median(z) fisher.test(zm,g)$p.value } Like most exact tests, it is quite conservative at small sample sizes. -thomas On Tue, 6 Apr 2010, cheba meier wrote: Dear all, What is the right

Re: [R] median of two groups

: On Fri, 7 May 2010, cheba meier wrote: Dear Thomas, I have been running simulations in order me to understand this problem! I have found something online where the absolute median difference is computed and permutations are ran to compute a p-value. Is such a test (if I can call it a test

Re: [R] median of two groups

, c(length(x),length(y))) m-median(z) fisher.test(zm,g)$p.value } Like most exact tests, it is quite conservative at small sample sizes. -thomas On Tue, 6 Apr 2010, cheba meier wrote: Dear all, What is the right test to test whether the median of two groups are statistically

[R] median of two groups

Dear all, What is the right test to test whether the median of two groups are statistically significant? Is it the wilcox.test, mood.test or the ks.test? In the text book I have got there is explanation for the Wilcoxon (Mann Whitney) test which tests ob the two variable are from the same

[R] reading excel into R

Dear all, I am new R user and I am sure that this question has been asked quite often and I have also googled it and read about it! I understood that in order to read excel sheet into R you need to open it and saved it as csv or text, is this true? or you can use read.delim2 and read.csv2 to do

[R] save data to an R object

Dear R people, Is it possible to save three data sets in an R object and to call each data from this object independently! Regards, Cheba [[alternative HTML version deleted]] __ R-help@r-project.org mailing list

Re: [R] save data to an R object

=test.Rda) #load them in another session load(test.Rda) df1 letter number 1 a 1 2 b 2 3 c 3 df2 letter number 1 d 4 2 e 5 3 f 6 Is that what you're looking for? Ivan Le 3/17/2010 11:56, cheba meier a écrit : Dear R