Displaying 2 results from an estimated 2 matches for "morder".
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2009 Jan 29
1
Inconsistency in F values from dropterm and anova
...t know how to calculate F values
from deviance tables (and can't seem to find anything suggesting how), and
so haven't been able to calculate F for myself to see which is more
accurate. Below is an example of the code, and I'm using R version 2.8.0.
> model1=glm(diff2^(0.491)~mtype*morder,family=Gamma)
> dropterm(model1,test="F")
Single term deletions
Model:
diff2^(0.491) ~ mtype * morder
Df Deviance AIC F value Pr(F)
23.181 -16.813
mtype:morder 3 24.729 -13.741 2.0694 0.1096
> model2=update(model...
2009 Aug 10
0
survival:: plotting survfit with two predictors
Hi R-Helpers,
I am having difficulty plotting a coxph model with two predictors. My
predictors are "morder" (a factor with five levels where the mean of
each level is plotted as a separate line) and tmean (continuous). When
I run a model with just morder it is fine and the plot is fine. When I
add tmean, the coxph model runs fine but this model will not plot and I
receive an error message....