[R] Quoting smooth random terms mccv::gam

[Simon Wood]

I would quote the p-value, but not the statistic (as it is not a 
standard F stat). The actual statistic is given here:

https://academic.oup.com/biomet/article-pdf/100/4/1005/566200/ast038.pdf

On 14/12/2018 04:33, Smith, Desmond wrote:
> Dear All,
>
> I have a mgcv::gam model of the form:
>
> m1 <- gam(Y ~ A + s(B, bs = "re"), data = dataframe, family = gaussian, method = "REML")
>
> The random term is quoted in summary(m1) as, for example,
>
> Approximate significance of smooth terms:
>             # edf Ref.df      F p-value
> s(B)  4.486      5 97.195 6.7e-08 ***
>
> My question is, how would I quote this result (statistic and P value) in a formal document?
>
> For example, one possibility is F[4.486,5] = 97.195, P = 6.7e-08. However, arguing against this, “reverse engineering” of the result using
>
> pf(q= 97.195, df1= 4.486, df2= 5, lower.tail=FALSE)
>
> gives an incorrect p value:
>
> [1] 0.1435508
>
> I would be very grateful for your advice. Many thanks for your help!
>
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