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...data.frame header that looks like this: v2FfaPre15 v2FfaPre10 v2FfaPre5 v2Ffa2 v2Ffa3 v2Ffa4 I need it to look like this, 15 10 5 2 3 4 i.e., with v2FfaPre and v2Ffa stripped off Any suggestions, Thanks in advance! -- Oscar Oscar A. Linares, MD Translational Medicine Unit LaPlaisance Bay, Bolles Harbor Monroe, Michigan 48161 Department of Medicine, University of Toledo College of Medicine Toledo, OH 43606-3390 Department of Internal Medicine, The Detroit Medical Center (DMC) Harper University Hospital Wayne State University School of Medicine Detroit, Michiga...

...EventEpochs,2,fract) but, no surprise it did not work as apply works on matrices not data frames. How can I apply a fuction to the columns of a data frame? (I can't covert data5NonEventsEpochs to a matrix as it contains character data). Thank you, John John David Sorkin M.D., Ph.D. Professor of Medicine Chief, Biostatistics and Informatics University of Maryland School of Medicine Division of Gerontology and Geriatric Medicine Baltimore VA Medical Center 10 North Greene Street GRECC (BT/18/GR) Baltimore, MD 21201-1524 (Phone) 410-605-7119 (Fax) 410-605-7913 (Please call phone number above prior to...

...5.464 E2 37.2 E2 12.639 E2 16.791 E2 36.996 E2 22.808 CC 1.975 CC 3.125 CC 4.433 CC 6.154 CC 4.175 NC 9.301 NC 13.531 NC 12.84 NC 14.336 NC 25.102 Please help. -- Oscar Oscar A. Linares, MD Translational Medicine Unit LaPlaisance Bay, Bolles Harbor Monroe, Michigan 48161 Department of Medicine, University of Toledo College of Medicine Toledo, OH 43606-3390 Department of Internal Medicine, The Detroit Medical Center (DMC) Harper University Hospital Wayne State University School of Medicine Detroit, Michiga...

...1.429574183 41.604787 43.03436 3 9.12e-06 9.12e-01 0.035704097 0.124131665 45.062952 45.18708 3 2.99e-05 2.99e+00 0.010169719 1.261369666 51.920969 53.18234 3 4.32e-05 4.32e+00 0.000490530 0.000000000 16.030226 16.03023 Oscar -- Oscar Oscar A. Linares, MD Translational Medicine Unit LaPlaisance Bay, Bolles Harbor Monroe, Michigan 48161 Department of Medicine, University of Toledo College of Medicine Toledo, OH 43606-3390 Department of Internal Medicine, The Detroit Medical Center (DMC) Harper University Hospital Wayne State University School of Medicine Detroit, Michiga...

...ot;, ylab = "3H-NE (dpm/ml)", log = "y", ylim=c(1,1000),cex=1.25, pch=16,col=1) lines(times, predictionssu(fit.wt.su, times)) lines(times, predictionsup(fit.wt.up, times), lty = "dashed") Deeply grateful in advance... -- Oscar Oscar A. Linares, MD Translational Medicine Unit LaPlaisance Bay, Bolles Harbor Monroe, Michigan 48161 Department of Medicine, University of Toledo College of Medicine Toledo, OH 43606-3390 Department of Internal Medicine, The Detroit Medical Center (DMC) Harper University Hospital Wayne State University School of Medicine Detroit, Michiga...

Colleagues, I have a matrix of character data that represents date and time. The format of each element of the matrix is "2020-09-17_00:00:00" How can I convert the elements into a valid R date-time constant? Thank you, John John David Sorkin M.D., Ph.D. Professor of Medicine, University of Maryland School of Medicine; Associate Director for Biostatistics and Informatics, Baltimore VA Medical Center Geriatrics Research, Education, and Clinical Center;? PI?Biostatistics and Informatics Core, University of Maryland School of Medicine Claude D. Pepper Older Americans Ind...

...upedData(THmean~INTRVNTN+TimePtID+INTRVNTN*TimePtID|PatientID,data=smalldata) Warning messages: 1: In Ops.factor(INTRVNTN, TimePtID) : ?+? not meaningful for factors 2: In Ops.factor(INTRVNTN, TimePtID) : ?*? not meaningful for factors Thank you, John John David Sorkin M.D., Ph.D. Professor of Medicine Chief, Biostatistics and Informatics University of Maryland School of Medicine Division of Gerontology and Geriatric Medicine Baltimore VA Medical Center 10 North Greene Street GRECC (BT/18/GR) Baltimore, MD 21201-1524 (Phone) 410-605-7119 (Fax) 410-605-7913 (Please call phone number above prior to...

David, predict.glm and se.fit were exactly what I was looking for. Many thanks! John John David Sorkin M.D., Ph.D. Professor of Medicine Chief, Biostatistics and Informatics University of Maryland School of Medicine Division of Gerontology and Geriatric Medicine Baltimore VA Medical Center 10 North Greene Street GRECC (BT/18/GR) Baltimore, MD 21201-1524 (Phone) 410-605-7119 (Fax) 410-605-7913 (Please call phone number above prior to...

...;t mind if I get these on the log scale; I can get the anti-log. Can you suggest how I can get the point estimate and its SE for "regional"? The predict function will give the point estimate, but not (to my knowledge) the SE. Thank you, John John David Sorkin M.D., Ph.D. Professor of Medicine Chief, Biostatistics and Informatics University of Maryland School of Medicine Division of Gerontology and Geriatric Medicine Baltimore VA Medical Center 10 North Greene Street GRECC (BT/18/GR) Baltimore, MD 21201-1524 (Phone) 410-605-7119 (Fax) 410-605-7913 (Please call phone number above prior to...

...usually needs to specify an escape characters in a path new which would suggest my path should be \\\Theserver\\mydirectory\\data.csv This does not work; the file is not found. What is the correct way to specify a path to a server Thanks, John John David Sorkin M.D., Ph.D. Professor of Medicine Chief, Biostatistics and Informatics University of Maryland School of Medicine Division of Gerontology and Geriatric Medicine Baltimore VA Medical Center 10 North Greene Street GRECC (BT/18/GR) Baltimore, MD 21201-1524 (Phone) 410-605-7119 (Fax) 410-605-7913 (Please call phone number above prior to...

...ot;, "z")]) : argument is not numeric or logical: returning NA It is clear the the mean function does not like the data I am passing to it. I do not know why. How might I correct my code? As always, Thank you, John Thank you, John John David Sorkin M.D., Ph.D. Professor of Medicine Chief, Biostatistics and Informatics University of Maryland School of Medicine Division of Gerontology and Geriatric Medicine Baltimore VA Medical Center 10 North Greene Street GRECC (BT/18/GR) Baltimore, MD 21201-1524 (Phone) 410-605-7119 (Fax) 410-605-7913 (Please call phone number above prior to...

...n the log scale; I can get the anti-log. Can you suggest how I can get the point estimate and its SE for "regional"? The predict function will give the point estimate, but not (to my knowledge) the SE. > Thank you, > John > > John David Sorkin M.D., Ph.D. > Professor of Medicine > Chief, Biostatistics and Informatics > University of Maryland School of Medicine Division of Gerontology and Geriatric Medicine > Baltimore VA Medical Center > 10 North Greene Street > GRECC (BT/18/GR) > Baltimore, MD 21201-1524 > (Phone) 410-605-7119 > (Fax) 410-605-7913...

...S's Proc Varclus implements an oblique cluster analysis based on principal components. How can I find out if R has a package that runs the same algorithm implemented in SAS "Proc Varclus"? Thank you, Mary Helen Black __________________________ Mary Helen Black, M.S. Keck School of Medicine of USC Department of Preventive Medicine Division of Biostatistics Phone: 323-442-3073 (office) E-mail: mhbridge at usc.edu

...eone can explain to me the function of include.lowest and right in the call to cut. As demonstrated in my example below, the parameters do not seem to alter the results of using cut. Thank you, John P.S. How do I find FAQ 7.31? Thank you, John I John David Sorkin M.D., Ph.D. Professor of Medicine Chief, Biostatistics and Informatics University of Maryland School of Medicine Division of Gerontology and Geriatric Medicine Baltimore VA Medical Center 10 North Greene Street GRECC (BT/18/GR) Baltimore, MD 21201-1524 (Phone) 410-605-7119 (Fax) 410-605-7913 (Please call phone number above prior to...

...# This lists the coefficeints, SEs, z and p values, but I can't isolate the pvalues. names(summary(fitwean)) # I see the coefficients, but not the p values names(fitmens) # p values are not found here. Thank you! John John David Sorkin M.D., Ph.D. Professor of Medicine Chief, Biostatistics and Informatics University of Maryland School of Medicine Division of Gerontology and Geriatric Medicine Baltimore VA Medical Center 10 North Greene Street GRECC (BT/18/GR) Baltimore, MD 21201-1524 (Phone) 410-605-7119 (Fax) 410-605-7913 (Please call phone number above prior to...

...o the funciton works > yfun(10,100,10) [1] 9 > # use uniroot to find a solution to the > # funciton in the range -100 to 100 > uniroot(yfun(x,10,20),c(-100,100)) Error in yfun(x, 10, 20) : object 'x' not found Thank you, John John David Sorkin M.D., Ph.D. Professor of Medicine Chief, Biostatistics and Informatics University of Maryland School of Medicine Division of Gerontology and Geriatric Medicine Baltimore VA Medical Center 10 North Greene Street GRECC (BT/18/GR) Baltimore, MD 21201-1524 (Phone) 410-605-7119 (Fax) 410-605-7913 (Please call phone number above prior to...

...D,data=smalldata) > Warning messages: > 1: In Ops.factor(INTRVNTN, TimePtID) : ?+? not meaningful for factors > 2: In Ops.factor(INTRVNTN, TimePtID) : ?*? not meaningful for factors > > > Thank you, > > John > > > John David Sorkin M.D., Ph.D. > Professor of Medicine > Chief, Biostatistics and Informatics > University of Maryland School of Medicine Division of Gerontology and Geriatric Medicine > Baltimore VA Medical Center > 10 North Greene Street > GRECC (BT/18/GR) > Baltimore, MD 21201-1524 > (Phone) 410-605-7119 > (Fax) 410-605-7913...

...Followup<-postDate-preDate. I would appreciate any suggestion that would help me read the dates as dates and thus allow me to calculate follow-up time. Thanks John John Sorkin M.D., Ph.D. Chief, Biostatistics and Informatics Baltimore VA Medical Center GRECC and University of Maryland School of Medicine Claude Pepper OAIC University of Maryland School of Medicine Division of Gerontology Baltimore VA Medical Center 10 North Greene Street GRECC (BT/18/GR) Baltimore, MD 21201-1524 410-605-7119 - NOTE NEW EMAIL ADDRESS: jsorkin at grecc.umaryland.edu

...t, there is an error from R? AR * total_dose_tau = 658 but that is wrong Total Dose (mg) = 279 * AR (=2.4) = 670 Please help. I don't want to harm anyone. A difference of 12 mg of a highly toxic drug can at the very least cause significant harm. -- Oscar Oscar A. Linares, MD Translational Medicine Unit La Plaisance Bay, Bolles Harbor Monroe, Michigan 48161 Department of Medicine, University of Toledo College of Medicine Toledo, OH 43606-3390 Department of Internal Medicine, The Detroit Medical Center (DMC) Harper University Hospital Wayne State University School of Medicine Detroit, Michig...

...="little",signed=FALSE) It works fine for n=10^8, but fails for n=10^9 (or even at n=6*10^8). My machine$sizeof.long is 8 bit. I am running R 2.13.1 on a x86_64-apple-darwin9.8.0/x86_64 (64-bit) architecture. Thanks for your help Florian -- AXA doctoral fellow Bundy lab - Biomolecular Medicine Imperial College London -- AXA doctoral fellow Bundy lab - Biomolecular Medicine Imperial College London [[alternative HTML version deleted]]