similar to: ramdom sampling from a dataset

I am trying to get R to randomly select values from my dataset (i.e. bootstrapping) with replacement. However, my attempts at this have been unsuccessful. Here is a basic example of what I am doing: I have a data vector of 8 values (i.e. data= 2,5,9,4,5,6,7,8). I used the sample function and it worked. However, it only repeated my values in the exact same order as the dataset. It did not

I have R randomly sampling my array made up of 2 columns of data. Here is my code randomly sampling 5 different rows from my dataset to create a new dataset of 8 rows of data: testdat<-growth[sample(5,8,replace=T),] Now I want to tell R to repeat this function 50 times and give me the output. I have been searching the internet and have been unable to figure this out. Any advice

I am trying to get R to resample my dataset of two columns of age and length data for fish. I got it to work, but it is not resampling every replicate. Instead, it resamples my data once and then repeated it 5 times. Here is my dataset of 9 fish samples with an age and length for each one: Age Length 2 200 5 450 6 600 7 702 8 798 5 453 4 399 1 120 2 202 Here is my code which resamples my

Thanks to the people on this list I was able to fix my code for randomly sampling. Thanks. Now, I am moving on to the next step and I ran into another snag. I have a large dataset but I am starting with a small made-up dataset until I figure it out. I have two columns of data (age and length). I got R to read my data called growth which is the age and length for 10 fish: >

I calculated a large vector. Unfortunately, I have some measurement error in my data and some of the values in the vector are erroneous. I ended up wih some Infs and NaNs in the vector. I would like to filter out the Inf and NaN values and only keep the values in my vector that range from 1 to 20. Is there a way to filter out Infs and NaNs in R and end up with a clean vector? Mike

I apologize if this comes across as confusing. I will try to explain my situation as best I can. I have R bootstrapping my growth data for fish. It's resampling my database of age and length data and then produces several new datasets for me. In this case, it's resampling my data to create three new datasets of age and length data. Here is my code with my original data called

I forgot to add that I first gave a starting value for K. Nonlinear least squares won't work because my errors are not normally distributed. Any advide on my maximum likelihood function would be greatly appreciated. ---------------------------- Original Message ---------------------------- Subject: RE: [R] maximum likelihood problem From: "Ravi Varadhan" <rvaradhan at

I am trying to figure out how to run maximum likelihood in R. Here is my situation: I have the following equation: equation<-(1/LR-(exp(-k*T)*LM)*(1-exp(-k))) LR, T, and LM are vectors of data. I want to R to change the value of k to maximize the value of equation. My attempts at optim and optimize have been unsuccessful. Are these the recommended functions that I should use to maximize

It turns out I didn't have to filter out the 1-20 values. The code of x[is.finite(x)] did the trick. Thanks!!! Mike ---------------------------- Original Message ---------------------------- Subject: Re: [R] cleaning up a vector From: "Henrique Dallazuanna" <wwwhsd at gmail.com> Date: Fri, October 1, 2010 1:55 pm To: mlarkin at rsmas.miami.edu Cc: r-help

I''m trying to specify that a particular view must render two different partials. My spec looks like: describe AClass do it do template.should_receive(:render).with(:partial => ''foo'', :locals => { ... }) ... end describe ''some conditional case'' do it do template.should_receive(:render).with(:partial =>

Hello - I am attempting to test rsync on a series of 8 MacOS X servers. On my initial test, I configured one machine as the "sender" and one machine to "receive." On the "sending" machine, I created an rsyncd.conf file. On the "receiving" machine, I issued the command rsync --daemon To which I got no error messages. On the "sending"

Hi, I am doing a research project on application frameworks (specifically the evaluation and selection of) and Rails is one of the key frameworks I am evaluating. Does anyone know of any case studies on RoR out on the Internet? Is anyone prepared to write up a case study for me on a project that succeeded thanks to the structure and dynamism of Rails? Only needs to be 1 page. Anyone who

Dear all, I have a bivariate dataset from a preliminary study. I want to do two things: (1) estimate the probability density of this bivariate distribution using some nonparametric method (kernel, spline etc); (2) sample a big dataset from this bivariate distribution for a simulation study. Is there any good method or package I can use in R for my work? I don?t want parametric models like

Hi there I''m considering Rails for a new web-application planned to be built from scratch. The application has an extensive web front, and in fact most of the application is interfaced through that front and engaged through clients'' HTTP requests (i.e. the conventional way web-applications and "dynamic web-sites" work). However, some essential parts are supposed to

hi , Now I have two dataset and want to compare them with same sample. Dataset A: year mon day obs 2010 03 12 12 2010 03 18 22 2010 04 12 62 2010 07 24 29 Dataset B: year mon day obs 2010 03 12 15 2010 04 12 57 2010 07 24 32 2010 08 23 15 As you see,dataset A and B have several observation data but their obs data is not

I am trying to read in a large SAS dataset (1706 observations, 72 variables) using the foreign package. R crashes, with the error message "This program has performed an illegal operation and will be shut down." The details given include "RGUI caused an invalid page fault in module FOREIGN.DLL at 015f:14c327e7." Bearing in mind the statement on p.2 of the R Data

Thanks to the help of people from this forum I was able to bootstrap my data and then apply a model to it. Thanks for all your help. Everything worked out well, but I am having a difficult time getting the new parameter values. I bootstrapped the data 300 times and I want to get the 300 sets of parameter estimates and plot them in Excel. Here is my code:

The University of Miami's Rosenstiel School of Marine and Atmospheric Sciences (RSMAS) is seeking a research associate to work with hydrographic data. The objective of the project is to develop statistical models for estimating salinity and density from observations of temperature together with knowledge of location and time. Because the relationship between salinity and temperature can be

The University of Miami's Rosenstiel School of Marine and Atmospheric Sciences (RSMAS) is seeking a research associate to work with hydrographic data. The objective of the project is to develop statistical models for estimating salinity and density from observations of temperature together with knowledge of location and time. Because the relationship between salinity and temperature can be

Hi everyone. I''m trying to figure out how to implement site-wide tagging for my website. I have a rails-based weblog that supports tagging posts. There''s a has_and_belongs_to_many relationship between posts and tags. I''d like to now reuse those tags for tagging links as well. Where I have a posts_tags table with post_id and tag_id fields, I''d like to