Displaying 13 results from an estimated 13 matches similar to: "Help with lmer formula"
2008 Jun 15
2
R vs SAS and HLM on multilevel analysis- basic question
Hi R users!
I am trying to learn some multilevel analysis, but unfortunately i am now very confused. The reason: http://www.ats.ucla.edu/stat/hlm/seminars/hlm_mlm/mlm_hlm_seminar.htm
http://www.ats.ucla.edu/stat/sas/seminars/sas_mlm/mlm_sas_seminar.htm
and
MlmSoftRev. pdf from mlmRev package.
>From what i see, the first two links seem to declare the level one variable as a random part (i
2006 May 20
5
Can lmer() fit a multilevel model embedded in a regression?
I would like to fit a hierarchical regression model from Witte et al.
(1994; see reference below). It's a logistic regression of a health
outcome on quntities of food intake; the linear predictor has the form,
X*beta + W*gamma,
where X is a matrix of consumption of 82 foods (i.e., the rows of X
represent people in the study, the columns represent different foods,
and X_ij is the amount of
2007 Nov 07
2
Save as postScrips latest R version
Hi,
I was using the 2.4.1 R version and I had no problem
saving my plots as postScript. Now that I have
installed the latest version 2.6.0 I can not save any
plot as postScript. When I try the following message
appears:
Erro: Invalid font type
Al?m disso: Warning messages:
1: font family not found in PostScript font database
2: font family not found in PostScript font database
What should I
2013 Jul 24
4
Error al utilizar twitteR
Buenas tardes a tod@s,
Estoy incursionando en el analisis de tweets utilizando el paquete twitteR
y siguiendo http://www.webmining.cl/2012/07/text-mining-de-twitter-usando-r/
Desafortunadamente cuando ejecuto
# cargar librerias
library(twitteR)
library(tm)
library(wordcloud)
# recolecta tweets de @camila_vallejo
tweets = userTimeline("camila_vallejo", 2000)
obtengo
Error in
2006 Aug 14
1
ARMA(1,1) for panel data
Dear List,
I am new to TS-Modeling in R. I would like to fit an ARMA(1,1) model
for a balanced panel, running Y on a full set of unit and year dummies
using an arma(1,1) for the disturbance:
y_it=unit.dummies+yeardummies+e_it
where: e_it=d*e_it-1+u_it+q*u_it-1
How can I fit this model in R? arma() does not seem to take covariates
(or I don't understand how to specify the function so that
2007 Mar 16
3
corAR1 in a random effects panel
Hi everyone,
I am interested in estimating this type of random effects panel:
y_it = x'_it * beta + u_it + e_it
u_it = rho * u_it-1 + d_it rho belongs to (-1, 1)
where:
u and e are independent and normally zero-mean distributed.
d is also independently normally zero-mean distributed.
So, I want random effects for group i to be correlated in t, following an
AR(1) process.
I am
2007 Mar 17
1
Correlated random effects in lme
Hello,
I am interested in estimating this type of random effects panel:
y_it = x'_it * beta + u_it + e_it
u_it = rho * u_it-1 + d_it rho belongs to (-1, 1)
where:
u and e are independently normally zero-mean distributed.
d is also independently normally zero-mean distributed.
So, I want random effects for group i to be correlated in t, following an
AR(1) process.
Any idea of how
2010 Feb 03
1
Package plm & heterogenous slopes
Dear r-helpers,
I am working with plm package. I am trying to fit a fixed effects (or
a 'within') model of the form
y_it = a_i + b_i*t + e_it, i.e. a model with an individual-specific
intercept and an individual-
specific slope.
Does plm support this directly?
Thanks in advance!
Otto Kassi
2012 Mar 08
1
Panel models: Fixed effects & random coefficients in plm
Hello,
I am using {plm} to estimate panel models. I want to estimate a model that
includes fixed effects for time and individual, but has a random individual
effect for the coefficient on the independent variable.
That is, I would like to estimate the model:
Y_it = a_i + a_t + B_i * X_it + e_it
Where i denotes individuals, t denotes time, X is my independent variable,
and B (beta) is the
2006 Oct 17
0
Are there ANOVA for compositional data?
The compositional data xi=(x_i1, x_i2,..., x_in), for each fixed i ,
xij>0, and sum(xij)=1;
I want to compare the mean( u_i) of several groups
i.e.
H0: u_1=u_2=...=u_N
or
Hj0: u_1j=u_2j=...=u_Nj
Are there any ANOVA tpye tools to do this work in R?
Thanks,
WEN S Q
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2013 Jul 24
0
Error al utilizar twitteR
Estimado Jorge Velez
Hace un tiempo yo intente sobre algo parecido, pero utilizando nuestros
propios correos, lástima que estoy con otros problemas para resolver y quede
desactualizado, sin embargo por ahí leí que hay una modificación de política
por parte de twitter, muchos lectores quedaron si acceso, esto puede ser el
error en tweets = userTimeline("camila_vallejo", 2000)
Aunque
2013 Jul 25
1
Resumen de R-help-es, Vol 53, Envío 38
Hola Jorge.
Para poder correr las funciones del library twitteR tienes que tener varias
cosas. Una cuenta en twitter y con esa cuenta inscribirte como developer en
dev.twitter.com. Posterior a esto tienes que inscribir un app dentro de
twitter y con las claves que se otorgan tienes que correr la función de
autorizacion que ya te indicaron.
Varias aclaraciones, la librería puede generar problemas
2012 Sep 26
2
Retrieve regression summary results after rq
Hi all,
I am using quantile regression with svy design. I want to retrieve
summary regression statistics (std error, p-value), since I don't have
any in my output:
Commands:
clus1_d<- svydesign(id=~cd002_co, weights=~wtper, strata=~str, data=data)
bclus1<-as.svrepdesign(clus1_d,type="bootstrap",replicates=100)
fit1<-