On Thu, 2009-09-10 at 14:58 +0100, Corrado wrote:
> Dear R list,
>
> is it possible to force the intercept to assume the value of 0 (that is no
> intercept) in gam from gam package?
Just like you would in lm or glm for example, by adding -1 to your
formula. ?gam suggests you look at ?lm to see about the formulas for
example.
data(airquality)
mod0 <- gam(Ozone^(1/3) ~ lo(Solar.R) + lo(Wind, Temp) - 1,
data = airquality, na = na.gam.replace)
mod1 <- gam(Ozone^(1/3) ~ lo(Solar.R) + lo(Wind, Temp),
data = airquality, na = na.gam.replace)
summary(mod0)
summary(mod1)
HTH
G
>
> Regards
--
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Dr. Gavin Simpson [t] +44 (0)20 7679 0522
ECRC, UCL Geography, [f] +44 (0)20 7679 0565
Pearson Building, [e] gavin.simpsonATNOSPAMucl.ac.uk
Gower Street, London [w] http://www.ucl.ac.uk/~ucfagls/
UK. WC1E 6BT. [w] http://www.freshwaters.org.uk
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