Displaying 20 results from an estimated 1000 matches similar to: "model simplification using Crawley as a guide"
2007 Jul 03
2
The R Book by M. J. Crawley
Hello all-
I would appreciate any guidance that can be provided. I am new to R and
am
using it exclusively in a statistics program I am undertaking that
mainly references
Minitab. My focus is on data modeling and further more multivariate
data analysis
as much of my work in involves chemical measurements from custom sensors
using
all sorts of transduction methods. I am looking for a
2003 Oct 14
1
[OFF] Dataset for extra Crawley Chapter
Hi,
anybody have the dataset used in Gamma Errors chapter of the Crawley's books
(An Introduction to Data Analysis using S-Plus).
specifically the functionalresponse and the Density datasets.
Thanks
Ronaldo
--
For every problem there is one solution which is simple, neat, and wrong.
-- H. L. Mencken
--
|> // | \\ [***********************************]
| ( ? ? ) [Ronaldo Reis
2002 Dec 02
2
Crawley's book on S-Plus and one strangeness
Hi,
I have got to my hands an excellent book by Michael J. Crawley
``Statistical Computing: An Introduction to Data Analysis using
S-Plus'' (John Wiley & Sons, Ltd, ISBN 0-471-56040-5). Its beauty
for me is in the fact, that it is more of ``An Introduction to
Data Analysis'' than ``using S-Plus'', but I guess that it may be
of interest for many others.
Most of the
2003 Feb 13
1
fixed and random effects in lme
Hi All,
I would like to ask a question on fixed and random effecti in lme. I am
fiddlying around Mick Crawley dataset "rats" :
http://www.bio.ic.ac.uk/research/mjcraw/statcomp/data/
The advantage is that most work is already done in Crawley's book (page 361
onwards) so I can check what I am doing.
I am tryg to reproduce the nested analysis on page 368:
2011 Jun 28
2
coxph() - unexpected result using Crawley's seedlings data (The R Book)
Hi,
I ran the example on pp. 799-800 from Machael Crawley's "The R Book" using package survival v. 2.36-5, R 2.13.0 and RStudio 0.94.83. The model is a Cox's Proportional Hazards model. The result was quite different compared to the R Book. I have compared my code to the code in the book but can not find any differences in the function call. My results are attached as well as a
2006 Apr 04
1
Problem with Crawley book example
Hi,
I try to run the example of Crawley's Book on the page 661, but it fail, look
> repmeasures <-
read.table("../Packages/Crawley/data/repmeasures.txt",header=T)
> attach(repmeasures)
> rep <- as.factor(rep)
> library(nlme)
> model <- lme(height~seed,random=~time|rep/seed)
Erro em lme.formula(height ~ seed, random = ~time | rep/seed) :
iteration limit
2007 Oct 22
4
Bar plot with error bars
Apologies if this has been asked before. I am having trouble
understanding the R mailing list never mind R!
I am relatively new to R having migrated from Minitab and SPSS. I
have managed to do some more complicated statistics such as
hierarchical partitioning of variance on an 80,000 record dataset but
have to admit that drawing a simple bar plot I could do by hand is
proving extremely
2007 Feb 15
4
R book advice
I'm looking for a book for someone completely ignorant of statistics
who wishes to learn both statistics and R. I've found three
possibilities, one by Verzani ("Using R for Introductory Statistics"),
one by Crawley ("Statistics: An Introduction using R"), and one by
Dalgaard ("Introductory Statistics with R"). Do these books have
different emphases,
2006 Nov 23
1
nonlinear regression-getting the explained variation
Hi,
I'm trying to teach myself R, and by the way, re-learning statistics using
Crawley's "Statistics: an introduction using R".
I've reached the regression chapter, and when it deals with non-linear
regresion using the nls library I face the following problem:
I follow the steps---
>deer<-read.table("c:\\temp\\jaws.txt",header=T)
---data available at
2013 Jul 07
1
Hierarchical multi-level model with lmer: why are the highest-level random adjustments 0?
Hi all
I have a hopefully not too stupid question about multi-level /
mixed-effects modeling. I was trying to test a strategy from Crawley's
2013 R Book on a data set with the following structure:
- dependent variable: CONSTRUCTION (a factor with 2 levels)
- independent fixed effect: LENGTH (an integer in the interval [1, 61])
- random effects with the following hierarchical structure: MODE
2009 Dec 05
3
Referencing variable names rather than column numbers
I apologize for how basic a question this is. I am a Stata user who
has begun using R, and the syntax differences still trip me up. The
most basic questions, involving as they do general terms, can be the
hardest to find solutions for through search.
Assume for the moment that I have a dataset that contains seven
variables: Pollution, Temp, Industry, Population, Wind, Rain and
Wet.days. (This
From THE R BOOK -> Warning: In eval(expr, envir, enclos) : non-integer #successes in a binomial glm!
2010 Mar 30
3
From THE R BOOK -> Warning: In eval(expr, envir, enclos) : non-integer #successes in a binomial glm!
Dear friends,
I am testing glm as at page 514/515 of THE R BOOK by M.Crawley, that is
on proportion data.
I use glm(y~x1+,family=binomial)
y is a proportion in (0,1), and x is a real number.
I get the error:
In eval(expr, envir, enclos) : non-integer #successes in a binomial glm!
But that is exactly what was suggested in the book, where there is no
mention of a similar warning. Where am I
2008 Jun 03
1
Model simplification using anova()
Hello all,
I've become confused by the output produced by a call to
anova(model1,model2). First a brief background. My model used to predict
final tree height is summarised here:
Df Sum Sq Mean Sq F value Pr(>F)
Treatment 2 748.35 374.17 21.3096 7.123e-06 ***
HeightInitial 1 0.31 0.31 0.0178 0.89519
2006 Sep 08
1
Computing skewness and kurtosis with the moments package
Hi,
I'm a newcomer to R, having previously used SPSS. One problem I have
run into is computing kurtosis. A test dataset is here:
http://www.whinlatter.ukfsn.org/2401.dat
> library(moments)
> data <- read.table("2401.dat", header=T)
> attach(data)
> loglen <- log10(Length)
With SPSS, I get
Skewness -0.320
Kurtosis -1.138
With R:
> skewness(loglen)
[1]
2010 Apr 15
1
can't find "daphnia.txt" and others while working through Crawley's R-Book
I have a feeling that this is an embarassingly simple fix, but I've been at it for most of the morning and can't get things figured out.
I'm trying to work through some examples in Crawley's "The R Book". I have installed packages and libraries as described in the book, but when I try, for example:
data<-read.table("c:\\temp\\daphnia.txt", header=T)
2006 Oct 17
4
Book recommendation for newbie to stats and R?
I'm trying to learn statistics and R at the same time. I have an
undergraduate science degree and one year of calculus (30 years ago),
but never took a stats course. I hope to take some stats courses in the
next year, but thought I would start to see how much I could teach
myself.
I work for an organization that analyses behavior change communication
programs regarding HIV/AIDS and
2012 Oct 19
3
Newly installed version; can't run lm function
New installation seems to have behavior I cannot figure out. Here is illustrative sequence where I load a small data set (test) from Crawley's files and try to run a simple linear model and get an error message. Oddly, R reports that the variable 'test$ozone' is numeric while, after attaching test, the variable ozone is not numeric. Can someone please help? This behavior is
2002 Dec 09
2
Problem with differences between S+ and R in parsing output tables with $
R-wizards
I have successfully run with S+ a statistical power calculation for
non-normal distributions as presented in M. Crawley?s new book.? When I
tried the newest version of R on the same code, the $ parse statement
doesn't seem to retrieve the appropriate number from a table. Note that
some of the cosmetic differences in the two tables have to be dealt with
by the parser. Any ideas
2000 Apr 19
1
scale factors/overdispersion in GLM: possible bug?
I've been poking around with GLMs (on which I am *not* an expert) on
behalf of a student, particularly binomial (standard logit link) nested
models with overdispersion.
I have one possible bug to report (but I'm not confident enough to be
*sure* it's a bug); one comment on the general inconsistency that seems to
afflict the various functions for dealing with overdispersion in GLMs
2009 May 27
1
R Books listing on R-Project
I was wondering what the criteria were for including books on the Books
Related to R page <http://www.r-project.org/doc/bib/R-books.html>. (There is
no maintainer listed on this page.)
In particular, I was wondering why the following two books are not listed:
* Andrew Gelman, Jennifer Hill, *Data Analysis Using Regression and
Multilevel/Hierarchical Models*. (CRAN package 'arm')
*