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It doesn't seem too hard to come up with plausible ways in which this could give bad results. Suppose I sample rows from a large dataset, maybe for bootstrapping. Suppose the rows are non-randomly ordered, e.g. odd rows are males, even rows are females. Oops! Very non-representative sample, bootstrap p values are garbage. David On Wed, 19 Sep 2018 at 21:20, Duncan Murdoch <murdoch.duncan

On 19/09/2018 5:57 PM, David Hugh-Jones wrote: > > It doesn't seem too hard to come up with plausible ways in which this > could give bad results. Suppose I sample rows from a large dataset, > maybe for bootstrapping. Suppose the rows are non-randomly ordered, e.g. > odd rows are males, even rows are females. Oops! Very non-representative > sample, bootstrap p values are

I've just committed a couple of changes to R-devel related to requests at userR about the Windows installer. The first of these affects all platforms, but I've only tested it on Windows: I added an option "quit.with.no.save". If TRUE, then the default q("ask") prompt will not offer to save the workspace. This is in response to the observation that new users who

On x86-64 linux, in stage 2, I get: c++ -g -O2 -DIN_GCC -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Wold-style-definition -Wmissing-format-attribute -fno-common -DHAVE_CONFIG_H -o f951 \ fortran/arith.o fortran/array.o fortran/bbt.o fortran/check.o fortran/data.o fortran/decl.o

I've been thinking of adding the possibility of including "z" among the axes to be logged in image, contour, and persp. In the first two, it would only affect where the breaks were set if they are calculated automatically; it would have a bigger effect in persp. For example, image(x, y, z, log="z") would set 12 colours evenly spaced on a log scale of the z values.

Hi Duncan-- Nice simulation! The absolute difference in probabilities is small, but the maximum relative difference grows from something negligible to almost 2 as m approaches 2**31. Because the L_1 distance between the uniform distribution on {1, ..., m} and what you actually get is large, there have to be test functions whose expectations are quite different under the two distributions.

On Wednesday 30 July 2008 18:13:27 Duncan Sands wrote: > On x86-64 linux, in stage 2, I get: > > c++ -g -O2 -DIN_GCC -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Wold-style-definition -Wmissing-format-attribute -fno-common -DHAVE_CONFIG_H -o f951 \ > fortran/arith.o

A quick point of order here: arguing with Duncan in this forum is helpful to expose ideas, but probably neither side will convince the other; eventually, if you want this adopted in core R, you'll need to convince an R-core member to pursue this fix. In the meantime, a good, well-tested implementation in a user-contributed package (presumably written in C for speed) would be enormously

Dear dev team, I was sorry to see the announcement of Duncan about his retirement from maintaining the R Windows build and Rtools. Duncan, thank you incredibly much for your 15 years of devotion and your impressive contribution to the R community as a whole. Thinking about the future, I wondered whether there were plans for the succession of Duncan. Is it the intention to continue providing

Full_Name: Stefan Albrecht Version: 2.2.0 OS: Windows XP Submission from: (NULL) (194.127.2.74) Dear all, in the new R 2.2.0, the matrix indexing has been changed. In my opinion, this leads to an inconsistency when indexing one-row matrices. Take > (mat <- matrix(1:9, nrow = 3, dimnames = list(paste("r", 1:3, sep = ""), paste("c", 1:3, sep = ""))))

On 19/09/2018 3:52 PM, Philip B. Stark wrote: > Hi Duncan-- > > Nice simulation! > > The absolute difference in probabilities is small, but the maximum > relative difference grows from something negligible to almost 2 as m > approaches 2**31. > > Because the L_1 distance between the uniform distribution on {1, ..., m} > and what you actually get is large, there

Dear useRs, I'm having trouble building R packages in Windows 7 regarding HTML help Workshop. Pointing PATH to c:\Program Files\HTML help Workshop does work in Windows (e.g. Vista) and does not in Windows 7. Some tips?? Kind regards, -- Dr Eric B Ferreira Exact Sciences Department Federal University of Alfenas Brazil [[alternative HTML version deleted]]

For a well-tested C algorithm, based on my reading of Lemire, the unbiased "algorithm 3" in https://arxiv.org/abs/1805.10941 is part already of the C standard library in OpenBSD and macOS (as arc4random_uniform), and in the GNU standard library. Lemire also provides C++ code in the appendix of his piece for both this and the faster "nearly divisionless" algorithm. It would be

I am using the Daily Debian Wine builds (used to be the 'Drunkard' builds) to run the freeware version of the IDA Pro disassembler (see http://www.datarescue.be/downloadfreeware.htm). Until about two or three weeks ago it would run OK using wineconsole. Since that time, the window pops up then immediately disappears. Wineconsole exits with "Wine failed with return code 1". I

Hello R-listers! My first post to the list is a very simple one for those who use the software continuosly. I am trying to understand the fixed-x resampling and random-x-resampling method proposed by Fox about Bootstrapping. The doubt that I have is on the side of the model run in one of the functions expressed for fixed-x resampling. What I don't understand is: X=model.matrix, and the -1

On 2/9/24 21:39, Iago Gin? V?zquez wrote: > Duncan, do you think it's worth to comment this in R-devel list? Duncan filed a bug report via R bugzilla (thanks). There is no way to disable this functionality and it has existed for very long time, I tested that at least in R 3.0. Optionally ending the session was I believe intentional with Ctrl+D, when the input is empty, and it is also

Congratulations Eva I have been following this thread loosely. Well in the sense that I really didn't understand what was going on but hopefully thinking that I could learn something from it. Your approach to your particular setup didn't pay any attention to the heed by Duncan. So you hard headed (pig headed, stubborn as a monkey) wanted it to be your way. Now I guess you accidentally

> From: Martin Maechler <maechler@stat.math.ethz.ch> > > >>>>> "Duncan" == Duncan Murdoch <murdoch@stats.uwo.ca> > >>>>> on Sun, 28 Nov 2004 10:25:24 -0500 writes: > > Duncan> <........> > Duncan> <........> > > Duncan> We already have code to source() from the clipboard, and it could >

Duncan, do you think it's worth to comment this in R-devel list? Iago ________________________________ De: CALUM POLWART <polc1410 at gmail.com> Enviat el: divendres, 9 de febrer de 2024 18:28 Per a: Duncan Murdoch <murdoch.duncan at gmail.com> A/c: Iago Gin? V?zquez <iago.gine at sjd.es>; r-help at r-project.org <r-help at r-project.org> Tema: Re: [R] Avoiding Delete

I have a covariance matrix that is not positive semi-definite matrix and I need it to be via some sort of adjustment. Is there any R routine or package to help me do this? Thanks, Roger [[alternative HTML version deleted]]