Displaying 3 results from an estimated 3 matches for "vf1ident".
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varident
2006 Jul 17
1
Variance functions in package nlme
...using the (recommended)
nlme package (R version 2.3.1 on a Linux platform). When trying to reproduce
an example from Jose Pinheiro & Douglas Bates (2000, p 210) I get the
following error message (code to produce message pasted as well):
library("nlme")
data("Orthodont")
vf1Ident <- varIdent( c(Female = 0.5), form = ~ 1 | Sex )
vf1Ident <- initialize(vf1Ident, Orthodont)
Error in getClass(Class) : c("\"varIdent\" is not a defined class",
"\"varFunc\" is not a defined class")
In addition: Warning message:
the condition has lengt...
2012 May 02
3
Consulta gráfica
Hola,
Por favor, ¿podríais indicarme qué recursos (librerías o ideas) pueden resultar de utilidad para crear un gráfico del estilo del de la figura 3.8 del siguiente link?
http://www.tsc.uvigo.es/BIO/Bioing/ChrLDoc3.html#3.5
Actualmente estoy utilizando funciones muy básicas y la verdad es que no me encuentro muy satisfecha con el resultado.
Muchas gracias.
Eva
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2007 Jan 16
2
Gaussian glm for grouped data with unequal variances
Hello - I am fairly new to R, (i.e., ability to create functions/write
programs insignificant) and was wondering if there might be a convenient way
to model the following: I want to fit a gaussian glm to grouped data, while
allowing for unequal variances in each of the groups.
More specifically, my data set looks something like this:
----------------
data group
1 76 1
2 82 1
3