[R] loglinear models
jfox at mcmaster.ca
Wed Oct 23 22:00:13 CEST 2002
At 06:31 PM 10/23/2002 +0200, Vicente Piorno wrote:
>I am using the loglin function of the base package to fit log-linear models.
>I am interested in obtaining the parameter values and their standard errors.
>Parameters are easily obtained, but I haven't found the way of obtaining
>their standad errors. Is this possible with the loglin function? If not, is
>there any other function to get them?
The loglin function fits loglinear models by iterative proportional
fitting, so standard errors for the parameter estimates are not produced.
An alternative is to fit the model as a Poisson generalized linear model
with the glm function, using the cell counts as the response; glm produces
both estimated coefficients and standard errors, but be careful with the
parametrization: it is conventional to parametrize loglinear models using
sum-to-zero constraints (i.e., contr.sum).
I hope that this helps,
Department of Sociology
email: jfox at mcmaster.ca
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