[R] mgcv: beta coefficient and 95%CI

[clc]

Hi i am doing an environmental research

The equation is as follow:

gam(y1 ~ x1 + s(x2) + s(x3) + s(x4), family = gaussian, fit = true)

I would like to obtain the beta coefficient and 95CI of x4 (or s(x4)), what
should I do?

Thanks,
Lung
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