Thank you Duncan. Do you by chance know any way around this?
On Mon, Jan 18, 2021 at 11:58 AM Duncan Murdoch <murdoch.duncan at
gmail.com>
wrote:
> You are using add1 on an "lm" object, and add1.lm doesn't
have a trace
> parameter.
>
> Duncan Murdoch
>
> On 18/01/2021 10:55 a.m., Chao Liu wrote:
> > I have a few questions about using add1(). First of all, according to
> the R
> > document of add1(), the trace = TRUE function prints out progress
reports
> > but my attempts to do this have failed several times. So how do we
print
> > out the progress reports of adding terms to the model so as to test
for
> > improved fit (or not)? Also, why the LRT (likelihood-ratio test) value
is
> > not in the output? Any help is greatly appreciated! Example as
follows:
> >
> > require(graphics); require(utils)
> > lm1 <- lm(Fertility ~ ., data = swiss)
> > add1(lm1, scope = .~. + .^2, test="Chisq", trace = TRUE)
> >
> > #It seems that no progress report has been printed. Also `LRT` is
missing
> > Single term additions
> >
> > Model:
> > Fertility ~ Agriculture + Examination + Education + Catholic +
> > Infant.Mortality
> > Df Sum of Sq RSS AIC Pr(>Chi)
> > <none> 2105 191
> > Agriculture:Examination 1 10.7 2094 192 0.6251
> > Agriculture:Education 1 1.8 2103 193 0.8399
> > Agriculture:Catholic 1 75.0 2030 191 0.1915
> > Agriculture:Infant.Mortality 1 4.4 2101 193 0.7528
> > Examination:Education 1 48.7 2056 192 0.2943
> > Examination:Catholic 1 40.8 2064 192 0.3378
> > Examination:Infant.Mortality 1 65.9 2039 191 0.2216
> > Education:Catholic 1 278.2 1827 186 0.0099 **
> > Education:Infant.Mortality 1 93.0 2012 191 0.1451
> > Catholic:Infant.Mortality 1 2.4 2103 193 0.8184
> > ---
> > Signif. codes: 0 ?***? 0.001 ?**? 0.01 ?*? 0.05 ?.? 0.1 ? ? 1
> >
> > Best,
> >
> > Chao
> >
> > [[alternative HTML version deleted]]
> >
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> >
>
>
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