Displaying 20 results from an estimated 1100 matches similar to: "R book for economists"
2012 Jul 09
3
Predicted values for zero-inflated Poisson
Hi all-
I fit a zero-inflated Poisson model to model bycatch rates using an offset term for effort. I need to apply the fitted model to a datasets of varying levels of effort to predict the associated levels of bycatch. I am seeking assistance as to the correct way to code this.
Thanks in advance!
Laura
[[alternative HTML version deleted]]
2009 Nov 16
1
Paper on data exploration
R users doing data analysis may be interested in the following paper:
http://methodsblog.wordpress.com/2009/11/13/first-paper-now-online/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+wordpress%2Fmethodsblog+(methods.blog)
All data and R code is available.
Alain
-----
--------------------------------------------------------------------
Dr. Alain F. Zuur
First author of:
2008 Apr 11
4
Format regression result summary
Hello to the whole group.
I am a newbie to R, but I got my way through and think it is a lot easier to
handle than other software packages (far less clicks necessary).
However, I have a problem with respect to the summary of regression results.
The summary function gives sth like:
Residuals:
Min 1Q Median 3Q Max
-0.46743 -0.09772 0.01810 0.11175 0.42252
2012 Jul 09
2
mfrow and centering plots when there's an odd number
Let me start with an example:
par(mfrow=c(2,3))
for (i in 1:5){
x = rnorm(100)
y = .5*x + rnorm(100, 0, sqrt(1-.5^2))
plot(x,y)
}
Note that there's five plots and six spaces for those plots via mfrow,
leaving one row empty. Is there a way to have the bottom two plots
centered? I think it looks weird to have them left-justified. Thanks in
advance for the help!
--
Dustin Fife
PhD
2009 Sep 04
3
Using anova(f1, f2) to compare lmer models yields seemingly erroneous Chisq = 0, p = 1
Hello,
I am using R to analyze a large multilevel data set, using
lmer() to model my data, and using anova() to compare the fit of various
models. When I run two models, the output of each model is generated
correctly as far as I can tell (e.g. summary(f1) and summary(f2) for the
multilevel model output look perfectly reasonable), and in this case (see
below) predictor.1 explains vastly more
2009 Jul 30
1
creating subsets within lm()
Dear All,
the lm() function has the possibility to create a subset of the
possible explaining variables that you have. However, in the help
there is no example how to use this subset option. I tried the
following:
model<-lm(dependent.data$MPFD~.,data=explaining.data,subset=c(1,0,0,0,0,0,0,0,1,1,0,0))
MPFD is the dependent variable stored in the data frame
dependent.data, and all 12
2010 Jan 05
2
Checking for normality and homogeneity of variance
Dear all,
I'm a beginner of R and I need to carry out some three-way mixed ANOVAs.
Following examples at http://personality-project.org/r/r.anova.html, I
managed to get the ANOVA part, but I don't know how can I check data
normality and homogeneity of variance in R (since they're the required
assumptions of ANOVA analysis).
Are there any special command/packages? Could anyone give me
2009 Sep 17
1
Dealing with heterogeneity with varComb weights
Hi,
I am trying to add multiple variance structures such as the first example
below:
vf1 <- varComb(varIdent(form = ~1|Sex), varPower())
However my code below will not work can anybody please advise me?
VFcomb<-varComb(varExp(form=~depcptwithextybf),varFixed(form=~FebNAO))
also if you have two variables with the same weights function would you
write that as:
2009 Jul 27
2
local regression using loess
Hi, All,
I have a dataset with binary response ( 0 and 1) and some numerical
covariates. I know I can use logistic regression to fit the data. But I want
to consider more locally. So I am wondering how can I fit the data with
'loess' function in R? And what will be the response: 0/1 or the probability
in either group like in logistic regression?
Thank you,
Cindy
[[alternative HTML
2009 Oct 06
2
how to fit time varying coefficient regression model?
Hi - I read through dse package manual a bit. I'm not quite certain
how I can use it to estimate a time varying coefficient regression
model? I might pick up an inappropriate package. Any suggestion would
be greatly appreciated. Thank you.
rh
2009 Oct 05
2
GLM quasipoisson error
Hello,
I'm having an error when trying to fit the next GLM:
>>model<-glm(response ~ CLONE_M + CLONE_F + HATCHING
+(CLONE_M*CLONE_F) + (CLONE_M*HATCHING) + (CLONE_F*HATCHING) +
(CLONE_M*CLONE_F*HATCHING), family=quasipoisson)
>> anova(model, test="Chi")
>Error in if (dispersion == 1) Inf else object$df.residual :
missing value where TRUE/FALSE needed
If I fit
2009 Jul 31
3
Compare lm() to glm(family=poisson)
Dear R-helpers,
I would like to compare the fit of two models, one of which I fit using lm()
and the other using glm(family=poisson). The latter doesn't provide
r-squared, so I wonder how to go about comparing these
models (they have the same formula).
Thanks very much,
Mark Na
[[alternative HTML version deleted]]
2009 Jul 27
2
Multiple graphs
Hi,
I wrote a simple master function, run(), that has inside six qplot
functions. The goal is to type run() and have all six graphs appear as
separate windows so that I can copy them into PowerPoint for a client.
When I type run(), only the last graph appears, the first five
apparently being overwritten. How do I get all six in separate windows,
ready for copying?
By the way, is the a way
2009 Jul 29
8
Adding picture to graph?
Hi
while teaching R, the question came up if it would be possible to add
a picture (saved on the HDD) to a graph (generated by plot()), which
we could not answer.
It might easily kill a clean graph, but: is there a way of doing this,
even one should not do it?
On a similar line of thought: is it possibe to define own symbols so
that they can be used in the plot function with pch=?
Rainer
2008 Apr 21
1
Regression inclusion of variable, effect on coefficients
Hello dear R users!
I know this question is not strictly R-help, yet, maybe some of the guru's
in statistics can help me out.
I have a sample of data all from the same "population". Say my regression
equation is now this:
m1 <- lm(y ~ x1 + x2 + x3)
I also regress on
m2 <- lm(y ~ x1 + x2 + x3 + x4)
The thing is, that I want to study the effect of
2014 Sep 27
2
recomendación de librerías para mapas en Shiny
Muchas gracias Carlos, que rápidez!!, a ver que consigo, ya os pasaré el
link!
El 27 de septiembre de 2014, 19:18, Carlos Ortega <cof en qualityexcellence.es>
escribió:
> Hola Miguel,
>
> Aquí tienes algunos ejemplos:
>
>
> http://freigeist.devmag.net/r/819-fracking-in-your-neighborhood-shale-oil-and-gas-economic-impact-map.html
>
>
>
2014 Sep 27
2
recomendación de librerías para mapas en Shiny
Hola
Estoy ahora mismo en el MADData <http://www.maddata.es/>, y en proceso de
hacer un Shiny, quiero meterle un mapa con los puntos de medida del tráfico
y el tráfico. Pero como novato quería ver si me recomendais alguna librería
para hacer mapas y embeberlos en shiny, ya sea googlemaps, leaflet,
cartodb...
y cualquier enlace a buena documentación es muy bien recibido! :-)
Miguel
2009 Jul 20
2
Regression for loop test HELP! URGENT!
Hi everyone!
I'm new to R, and I've sent this message as a non-member, but since it's
pretty urgent, I'm sending it again now I'm on the mailing list (Thanks
Daniel for your suggestion nevertheless).
I have calculated a regression in the form of M ~ D + O + S, and I would
like to take this regression and test it with other samples, 5 sets of M, D,
O, and S at a time(I actually
2003 Mar 23
1
export lm object to ascii from batch mode
2013 Jan 14
0
Course: Introduction to zero inflated models and GLMM
We would like to announce the following statistics course:
Introduction to zero inflated models and GLMM
13 - 16 May 2013. Elche, Spain.
For details, see: http://www.highstat.com/statscourse.htm
Course flyer: http://www.highstat.com/Courses/Flyer2013_05Elche_ZIP.pdf
Kind regards,
Alain Zuur
--
Dr. Alain F. Zuur
First author of:
1. Analysing Ecological Data (2007).
Zuur, AF, Ieno, EN and