search for: bootstrap

Displaying 20 results from an estimated 3723 matches for "bootstrap".

2007 Jan 06
2
Bootstrapping Confidence Intervals for Medians
...(two days) and I have tried and tried to calculated confidence intervals for medians. Can someone help me? Here is my data: institution1 0.21 0.16 0.32 0.69 1.15 0.9 0.87 0.87 0.73 The first four observations compose group 1 and observations 5 through 9 compose group 2. I would like to create a bootstrapped 90% confidence interval on the difference of the medians (n2-n1). I have successfully calculated a permutation test. This shouldn't be as difficult as I am making it, would someone please enlighten me? Please reply to gilbertg at musc.edu as I have not subscribed to this list yet. TIA, G...
2012 Feb 21
2
bootstrap in time dependent Cox model‏
Dear R-list, I am wondering how to perform a bootstrap in R for the weighted time dependent Cox model? (Andersen?Gill format, with multiple observations from each patients) to obtain the bootstrap standard error of the treatment effect. Below is an example dataset. Would 'censboot' be appropriate to use in this context? Any suggestions/referen...
2007 Sep 04
1
bootstrap confidence intervals with previously existing bootstrap sample
Dear R users, I am new to R. I would like to calculate bootstrap confidence intervals using the BCa method for a parameter of interest. My situation is this: I already have a set of 1000 bootstrap replicates created from my original data set. I have already calculated the statistic of interest for each bootstrap replicate, and have also calculated the mean f...
2013 Jan 23
2
Problem with Bootstrap-SASS
I''ve installed bootstrap-sass, and added an @import line in my css. Rails won''t find or serve up the bootstrap files. One error msg on the Mozilla console says: The stylesheet http://localhost:3000/assets/bootstrap was not loaded because its MIME type, "application/javascript", is not "text/c...
2005 Mar 25
3
Stratified bootstrap question
Dear experts, I am asking for help with a question regarding to stratified bootstrap. My dataset is a longitudinal dataset (3 measurements per person at year 1, 4 and 7) composed of multiple clinic centers and multiple participants within each clinic. It has missing values. I want to do a bootstrap to find the standard errors and confidence intervals for my variance components. M...
2006 Jul 11
2
non positive-definite G matrix in mixed models: bootstrap?
...imated close to zero, and related confidence intervals are incredibly large. Since simplification of the random portion is not an option, for both interest in the parameters and significant increase in the model fit, I would like to collect "unbiased" random effects estimates. I used bootstrap to this purpose, creating a linear model for each cluster and bootstraping the variance of the coefficients. Is this procedure reasonable? Would it be reasonable in this case to keep the marginal portion of the mixed model? Note that in presence of positive-definite G matrix this bootstrap appro...
2001 Mar 06
3
Bootstrapping on R
Does R have a bootstrap command like SPlus, or do we have to form our own code if we want to do bootstrapping in R? Jason Parcon Western Michigan University e-mail addresses: s0parcon at wmich.edu parcon at stat.wmich.edu -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-...
2008 Jul 23
6
[LLVMdev] New llvm-gcc bootstrap failure
My nightly tester on x86_64-unknown-linux-gnu failed to bootstrap llvm-gcc today: Comparing stages 2 and 3 Bootstrap comparison failure! ./build/read-rtl.o differs The updates since the last bootstrap (24 hours before): went from revision 53904 to revision 53950. Ciao, Duncan.
2002 Jan 21
2
a Bootstrap understanding problem
I tried to reproduce a result from a former colleague which he got with S-plus bootstrap method. I don't have S-plus at hand. In R, there are 2 packages related to bootstrap method, bootstrap and boot. The former has a function called 'bootstrap' but this does not seem to conform either to the function used in S-plus nor to that described in MASS, 3d ed., p.144. The latter...
2018 May 21
2
Bootstrap and average median squared error
Dear R-experts, I am trying to bootstrap (and average) the median squared error evaluation metric for a robust regression. I can't get it. What is going wrong ? Here is the reproducible example. ############################# install.packages( "quantreg" ) library(quantreg) crp <-c(12,14,13,24,25,34,45,56,25,34,47,44,3...
2009 Jan 19
3
bootstrapped eigenvector method following prcomp
G'Day R users! Following an ordination using prcomp, I'd like to test which variables singnificantly contribute to a principal component. There is a method suggested by Peres-Neto and al. 2003. Ecology 84:2347-2363 called "bootstrapped eigenvector". It was asked for that in this forum in January 2005 by J?r?me Lema?tre: "1) Resample 1000 times with replacement entire raws from the original data sets [] 2) Conduct a PCA on each bootstrapped sample 3) To prevent axis reflexion and/or axis reordering in the bootstrap,...
2007 Nov 29
1
Bootstrap Correlation Coefficient with Moving Block Bootstrap
Hello. I have got two problems in bootstrapping from dependent data sets. Given two time-series x and y. Both consisting of n observations with x consisting of dependent and y consisting of independent observations over time. Also assume, that the optimal block-length l is given. To obtain my bootstrap sample, I have to draw pairwise, but...
2016 Nov 08
2
leaks in lld on the bot
The asan bootstrap bot is unhappy with lld. Rui, os someone, please take a look. http://lab.llvm.org:8011/builders/sanitizer-x86_64- linux-bootstrap/builds/138/steps/check-lld%20asan/logs/stdio ==26011==ERROR: LeakSanitizer: detected memory leaks Direct leak of 184 byte(s) in 1 object(s) allocated from: #0 0x7...
2005 Jan 29
1
Bootstrapped eigenvector
Hello alls, I found in the literature a technique that has been evaluated as one of the more robust to assess statistically the significance of the loadings in a PCA: bootstrapping the eigenvector (Jackson, Ecology 1993, 74: 2204-2214; Peres-Neto and al. 2003. Ecology 84:2347-2363). However, I'm not able to transform by myself the following steps into a R program, yet? Can someone could help me with this? I thank you very much by advance. Here are the steps that I...
2010 Oct 29
1
[PATCH] Bootstrap ocaml/.depend more thoroughly
Although I haven't experienced a specific problem with bootstrapping an empty .depend file, this commit bootstraps it properly using ocamldep. This may or may not solve any real problem, but it's quite simple and more obviously correct. --- bootstrap | 2 +- ocaml/Makefile.am | 10 +++------- ocaml/Makefile.depend | 6 ++++++ 3 files...
2013 Nov 11
1
Generating bootstrap samples from a panel data frame
With a data frame (call it *d*) composed of 2000 individuals and *n*observations for each individual (thus *2000n* observations in total), I would like to generate *k* bootstrap samples with replacement from *d*. Amongst other variables, *d* has a numeric variable *id* taking on identical value for observations belonging to the same individual. Taking into consideration the panel nature of the data, I want to generate many bootstrap samples with replacement and store each...
2004 Dec 17
1
Confidence Intervals from Bootstrap Replications
Hi All: I have to compute bootstrap confidence intervals, the statistic (incremental cost effectiveness ratio) is computed from two samples (intervention and control) of different sizes. All the bootstrap functions that I have seen use one dataset as argument. I may go ahead and get the desired number of bootstrap replications separa...
2016 Nov 08
3
leaks in lld on the bot
On Mon, Nov 7, 2016 at 5:53 PM, Davide Italiano <davide at freebsd.org> wrote: > On Mon, Nov 7, 2016 at 4:43 PM, Kostya Serebryany via llvm-dev > <llvm-dev at lists.llvm.org> wrote: >> The asan bootstrap bot is unhappy with lld. >> Rui, os someone, please take a look. >> >> http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-bootstrap/builds/138/steps/check-lld%20asan/logs/stdio >> >> ==26011==ERROR: LeakSanitizer: detected memory leaks >> >> Direct le...
2008 Jul 21
5
Coefficients of Logistic Regression from bootstrap - how to get them?
Hello all, I am trying to optimize my logistic regression model by using bootstrap. I was previously using SAS for this kind of tasks, but I am now switching to R. My data frame consists of 5 columns and has 109 rows. Each row is a single record composed of the following values: Subject_name, numeric1, numeric2, numeric3 and outcome (yes or no). All three numerics are used...
2007 May 21
1
Boostrap p-value in regression [indirectly related to R]
Hello All, Despite my preference for reporting confidence intervals, I need to obtain a p-value for a hypothesis test in the context of regression using bootstrapping. I have read John Fox's chapter on bootstrapping regression models and have consulted Efron & Tibshirani's "An Introduction to the Bootstrap" but I just wanted to ask the experts here for some feedback to make sure that I am not doing something wrong. Let's take a sim...