[Rd] anova and intercept

[Gabor Grothendieck]

Good idea.

On Mon, Dec 26, 2022 at 12:59 PM peter dalgaard <pdalgd using gmail.com> wrote:
>
> My usual advice on getting nonstandard F tests out of anova() is to fit the models explicitly and compare.
>
> So how about this?
>
> fit1 <- lm(diff(extra,10) ~ 1, sleep)
> fit0 <- update(fit1, ~ -1)
> anova(fit0, fit1)
>
> -pd
>
> > On 26 Dec 2022, at 13:49 , Gabor Grothendieck <ggrothendieck using gmail.com> wrote:
> >
> > Suppose we want to perform a paired test using the sleep data frame
> > with anova in R.  Then this works and gives the same p value as
> > t.test(extra ~ group, sleep, paired = TRUE, var.equal = TRUE)
> >
> >   ones <- rep(1, 10)
> >   anova(lm(diff(extra, 10) ~ ones + 0, sleep)
> >
> > This gives output but does not give an F test at all.
> >
> >   ones <- rep(1, 10)
> >   anova(lm(diff(extra, 10) ~ 1, sleep)
> >
> > Maybe there should be some way to force an F test to be produced for
> > the intercept in anova for consistency with t.test so that the second
> > code can be used.
> >
> >
> > --
> > Statistics & Software Consulting
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> > tel: 1-877-GKX-GROUP
> > email: ggrothendieck at gmail.com
> >
> > ______________________________________________
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>
> --
> Peter Dalgaard, Professor,
> Center for Statistics, Copenhagen Business School
> Solbjerg Plads 3, 2000 Frederiksberg, Denmark
> Phone: (+45)38153501
> Office: A 4.23
> Email: pd.mes using cbs.dk  Priv: PDalgd using gmail.com
>


-- 
Statistics & Software Consulting
GKX Group, GKX Associates Inc.
tel: 1-877-GKX-GROUP
email: ggrothendieck at gmail.com