Displaying 20 results from an estimated 40000 matches similar to: "Atomic setting of properties?"
2008 Nov 21
2
Growth rate determination using ANCOVA
I'm a programmer in a biology lab who is starting to use R to automate
some of our statistical analysis of growth rate determination. But I'm
running into some problems as I re-code.
1) Hypotheses concerning Slope similarity/difference:
I'm using R's anova(lm()) methods to analyse a model which looks
like this:
growth.metric ~ time * test.tube
I understand that
2012 Mar 03
2
Grouped barchart confidence intervals in lattice
Hi everyone,
I'm having trouble adding error bars to a grouped barchart in lattice. I know that this topic has been addressed quite a bit, as I've been searching the internet for a while to try to troubleshoot the issue, but I've not been able to find any solution that I could get working on my data. I was wondering if someone could look at my code and tell me what I'm doing
2010 Sep 29
2
fitting model to resampled data
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
2013 Nov 06
1
Treatment effects on measurements through time: how to tell when (in time) treatment has a significant effect?
Hi,
The data (attached) I am looking at consists of measurements of growth rate
at different ages, for individuals in two treatments (control and infected).
What I want to know is whether and when (what age) the growth rate of
infected individuals is higher than the growth rate for control individuals.
The simplest way to approach this question is to just do a t-test at each
age, but because
2013 Oct 07
1
Growth calculation
Hi,
This is not a sophisticated statistics question as the subject
suggests. But I am logging data - number of user sessions in a web
application - before and after new users are migrated. I use R to graph
but I am looking for a way to quantify the growth in the number of user
sessions. As more users are now using the web application there is a
growth.
What is the way to measure this
2007 Dec 09
1
package "growth" ... where is it ?
I would like to install the package "growth" as it contains the function
"corgram" and some other presumably useful stuff for time series analysis.
I can see it is in R standard library list:
http://hosho.ees.hokudai.ac.jp/~kubo/Rdoc/doc/html/packages.html<http://hosho.ees.hokudai.ac.jp/%7Ekubo/Rdoc/doc/html/packages.html>
2011 May 01
1
Simulation Questions
I have the following script for generating a dataset. It works like a champ except for a couple of things.
1. I need the variables "itbs" and "map" to be negatively correlated with the binomial variable "lunch" (around -0.21 and -0.24, respectively). The binomial variable "lunch" needs to remain unchanged.
2. While my generated variables do come out
2016 Apr 20
2
simulation in R
Hi R user,
Would you mind to help me to find the range with stochastic events? For example,
daT<-structure(list(sn = 1:14, growthrate = c(0.5, 0.6, 0.7, 0.99,
0.1, 0.3, 0.4, 0.5, 0.5, 0.2, 0.1, 0.4, 0.3, 0.43)), .Names = c("sn",
"growthrate"), class = "data.frame", row.names = c(NA, -14L))
I want to find the ranges of growth rate of the above data using Mote
2017 Apr 22
5
Git Transition status?
On 17 Jan 2017, at 01:17, Chris Lattner via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
> - The download size of a mono-repo is manageable, and seems scalable for a project the size of LLVM (including reasonable growth over the next 10 years).
Did you consider that GitHub has a 1GB size limit/recommendation?
https://help.github.com/articles/what-is-my-disk-quota/
The full mono-repo is
2008 Jan 14
1
stochastic growth rate (package biopop)
Dear all,
I am running matrix population models using package "popbio".
In a deterministic model {i.e., transition matrix is defined as A <-
matrix(c(0.70, 0.70,0.35,0.50), nrow=2,byrow=TRUE}, population growth rate
can be estimated from the dominant eigenvalue {command "eigen.analysis"}.
However, I cannot figure out the way to compute the asymptotic stochastic
population
2001 Sep 07
3
fitting models with gnls
Dear R-list members,
Some months ago I wrote a message on the usage of gnls (nlme library) and here I come again.
Let me give an example:
I have a 10 year length-at-age data set of 10 fishes (see growth.dat at the end of this message) and I want to fit a von Bertalanffy growth model, Li= Linf*(1-exp(-k*(ti-t0))) where Li = length at age i, Linf= asymptotic length, k= curvature parameter, ti=
2007 Nov 08
2
centile reference chart / clildren growth chart - what package/method to use
We are constructing growth charts (age/weight and age/length) for children
with diagnosis that impacts weight/length.
But we we don't know how to use R for producing growth charts.
We are collection data of Age, Weight and Length.
The data are used to produce diagnosis-specific Growth charts (like the CDC
Growth Charts:
1999 Sep 02
1
unresolved symbols in growth and repeated libraries
I am having trouble using Jim Lindsey's libraries because of unresolved
symbols. I am currently using R 0.65.0, but had this problem in earlier
releases as well. I have a RedHat 6.0 Linux on i386 and use egcs
(upgraded to that distributed with rawhide, after first failures with
the libraries):
egcs-g77-1.1.2-19
egcs-1.1.2-19
Installation of the libraries works but on loading
>
2005 May 26
1
aggregate and stack
Dear All,
I have tried to calculate tree mean growth but I think the structure I used below (growthresumo) is not the most elegant, even though it worked. The only problem I had in this first part was that I cannot use 'summary', just 'mean' (sorry but 'R' is pretty new for me).
>growthresumo <-
2006 Aug 31
2
cumulative growth rates indexed to a common starting point over n series of observations
What is the R way of computing cumulative growth rates given a series of
discrete values indexed .
For instance, given a matrix of 20 observations for each of 5 series (zz),
what is the most straight forward technique in R for computing cumulative
growth (zzcum) ?
It seems for the solution I'm after might be imbedding the following cum
growth rate calc as a function into a function call
2011 Jul 25
2
Wide confidence intervals or Error message in a mixed effects model (nlme)
I am analyzing a dataset on the effects of six pesticides on population
growth rate of a predatory mite. The response variable is the population
growth rate of the mite (ranges from negative to positive) and the
exploratory variable is a categorical variable (treatment). The
experiment was blocked in time (3 blocks / replicates per block) and it
is unbalanced - at least 1 replicate per block. I am
2003 Nov 12
1
"/" operator in model formula
Dear R-help folks,
Can someone guide me to a source where I can learn more about the / operator
in model formulae? I found a reference to it in Venables and Ripley's MASS,
p. 142, where it says, in reference to ANCOVA: "Terms of the form a/x,
where a is a factor, are best thought of as 'separate regression models of
type 1 + x within the levels of a.'..."
This seems
2010 Aug 11
1
Growth Curves with lmer
Dear all,
I have some growth curve data from an experiment that I try to fit using
lm and lmer. The curves describe the growth of classification accuracy
with the amount of training data t, so basically
y ~ 0 + t (there is no intercept because y=0 at t0)
Since the growth is somewhat nonlinear *and* in order to estimate the
treatment effect on the growth curve, the final model is
y ~ 0 + t +
2016 Apr 20
0
simulation in R
I realized that there was a typo error. I mean "Monte Carlo Simulation"
________________________________________
From: R-help <r-help-bounces at r-project.org> on behalf of Kristi Glover <kristi.glover at hotmail.com>
Sent: April 19, 2016 11:48 PM
To: R-help
Subject: [R] simulation in R
Hi R user,
Would you mind to help me to find the range with stochastic events? For
2010 Nov 01
3
Mean and individual growth curve trajectories
I'm trying to understand how to plot individual growth curve trajectories,
with the overall mean trajectory superimposed (preferably in a slightly
thicker line, maybe in black) over the individual trajectories. Using the
sleepstudy data in lme4, here is the code I have so far:
library(lme4)
library(lattice)
xyplot(Reaction ~ Days, data = sleepstudy, group = Subject, type = 'l')