similar to: How to compare two regression line slopes

Hi, I noticed a failure of mksh built with klibc on mips64el. The failing test, on a high level, is this: :>a sleep 2 :>b test a -nt b echo $? This is supposed to echo 1 (false) because a is not newer than b. The test code is roughly: // const char *opnd1 = "a"; // const char *opnd2 = "b"; // struct stat b1, b2; // int s; return (test_stat(opnd1, &b1) ==

Hello R users, I've used the following help two compare two regression line slopes. Wanted to test if they differ significantly: Hi, I've made a research about how to compare two regression line slopes (of y versus x for 2 groups, "group" being a factor ) using R. I knew the method based on the following statement : t = (b1 - b2) / sb1,b2 where b1 and b2 are the two slope

We have a development environment that every morning requires a restart because Mongrel just stops responding. I noticed this older thread...but I still experience the problem http://rubyforge.org/pipermail/mongrel-users/2006-August/000950.html We are running nginx..but I also have the mongrel ports open to our IPs..both going through nginx proxy and directly through mongrel fails...then

Oups, I sent the email by error, as I was still writing my reply… Spencer, Le 22-avr.-09 à 03:33, spencerg a écrit : > Is your first model a special case of the second with eta1 = 0? > If yes, what about using 2*log(likelihood ratio) being approximately > chi-square? Yes, the first model is a special case of the second with eta1=0… Could you give me more explanation about

Hi, I'm using a non linear model to fit experimental survival curves. This model describes the fraction of "still active" experiments as a function of time t as follows: f(t)=(1+exp(-etaD*cD)) / (1+exp(etaD(t-cD))) Moreover, when experiments are still active, they may change of state (from 0 to 1). But they may fall inactive before changing their state (their state still

Hi, I'm analyzing experimental results where two different events ("T1" and "T2") can occur or not during an experiment. I made my experiments with one factor ("Substrate") with two levels ("Sand" and "Clay"). I would like to know wether or not "Substrate" affects the occurrence probability of the two events. Moreover, for each

Hello, I'm using the function nlminb of the package stats inside a loop and when the number of trials grows, R crashes and says "R GUI front-end has stopped working". Could you help me with this problem? I have try in versions 2.15.1,2.15.2 and 3.0.0. > sessionInfo() R version 2.15.2 (2012-10-26) Platform: i386-w64-mingw32/i386 (32-bit) locale: [1]

Hi All, I am confused with SMATR's test for common slope. My null hypothesis here is that all slopes are parallel (common slopes?), right? So if I get a p value < 0.05 means that we can have confidence to reject it? That slopes are different? Or the other way around? it means that we have statistical confidence that the slopes are parallel? thanks -- Eugenio Larios PhD Student University

In short: I didn't take enough stats courses in college. Now I am working on scientific research and I feel somewhat lost when it comes to designing the statistical framework. I have looked through the books at: http://www.r-project.org/doc/bib/R-books.html I even tried to read [17] Julian J. Faraway. Linear Models with R. This book is too advanced. It helped a little bit but I still

Hi I have (8 measures * 96 groups) = 768 datasets for which I did linear regressions using lm(). Now I want to compare the slopes for each of the 8 measures in each of the 96 groups. As I understand , I can not use > anova(lm1, ..., lm8) as the lm1 ... lm8 are based on different datasets. I also read in previous discussions in this list, that I can see if the slope +- stddev(slope)

Hi, all, I am thinking to compare a group of slopes from regression lines to see if they are different overall, and then make specific comparisons between groups. How can I achieve that in R? I searched the archives and there are only discussions about comparing two lines a time. Thanks. A sample data set is like the following. I would like to compare the regression slopes between the five

Hi, I read almost all I found in prior R-Help list about How to compare two regression line slopes. So, I made a didactic example to illustrate a solution cited by Ben Bolker: =============================================== Subject: Re: [R] How to compare two regression line slopes From: Ben Bolker (bol... at ufl.edu) Date: Jan 27, 2009 1:52:20 pm List: org.r-project.r-help

Hi everyone, ? I am trying to do a horizonplot using my own time series data. I know that there is a horizonplot function in latticeExtra, but on closer examination i think that the graph itself is slightly wrong (it displays some regions as triangles and i think they should be trapezoids, and the red regions (that are below the baseline) are displayed on top of the blue areas ? while i think

---------- Forwarded message ---------- From: digital design <developer.fpga at gmail.com> Date: 21 March 2011 13:38 Subject: Re: [theora] alghorithm of working encoder in libtheora To: bens at alum.mit.edu Cc: Reply-All at xiph.org On 18 March 2011 23:15, Benjamin M. Schwartz <bmschwar at fas.harvard.edu>wrote: > On 03/18/2011 01:44 PM, digital design wrote: > > Now i

Hi, A have small technical question about the calculation of R-squared using lm(). In a study case with experimental values, it seems more logical to force the regression line to pass through origin with lm(y ~ x +0). However, R-squared values are higher in this case than when I compute the linear regression with lm(y ~ x). It seems to be surprising to me: is this result normal ? Is there

Hi, I need to compare non-linear fittings of 2 different experimental distributions. I use nls() to the fit the 2 distribution and it works pretty well. The statistical comparison of 2 non linear fits is well described in the book "Fitting Models to Biological Data using Linear and Nonlinear Regression" from Harvey Motulsky and Arthur Christopoulos. This test is based on the

Hope this isn't too far OT, but its relevant to us. From isn.attrition.org >http://www.informationweek.com/story/showArticle.jhtml?articleID=20300851 > >By W. David Gardner >TechWeb News >May 13, 2004 > >As voice over IP sweeps across the high-tech landscape, many IT >managers are being lulled into a dangerous complacency because they >look upon Internet phoning

Hi all, We have added celt to our application. We can get celt to encode/decode audio in one direction. It can be in either direction but, not both directions at the same time. Here is the problem from my programmer: The celt codecuses global static data and this makes it impossible to make two instances. This prevents us from making VoIP applications that need to code and decode at the same

Hi there, My startup, Matygo, is running our second live Rails for Beginners course starting next week. This course is for people who are new to Rails, or have yet to dive in, and want to get a head start getting up to speed. Registration Link: http://bit.ly/matygo-rails-beginners-jan-2012 Our classes are fully online but are quite interactive. This is how it works: 1. Weekly live group video

Here is what I have been doing with rsync(This is condinced version of the main script that runs): #!/usr/local/bin/bash SSH=/usr/local/bin/ssh RSYNC=/usr/local/bin/rsync SED=/usr/bin/sed USER=vmladmin ROLLLISTDIR=/home/vmladmin/rolllists/ ROLLFILE=${ROLLLISTDIR}rollfile.${CELERITYID} EXCLUDEFILE=${ROLLLISTDIR}rollfile.exclude RSYNC_OPT="-zrc --delete"