On Jun 20, 2011, at 1:25 AM, pigpigmeow wrote:
I'm beginner in R! I have a lot of problems on R.....
I have three questions about GAM
1. What is the function of Gaussian distribution in GAM?(if I choose
family
is Gaussian)
Specifies an an error distribution.
Is it used in the predictand value (Y)?
I don't understand the question except to say that model structure
would always influence predictions.
2. How to plot a graph the gam function?
For example: y<-gam(a~s(b),family=gaussian (link=log)
,Data)
how to plot x axis is s(b) and y axis is log a???
The usual way to plot an R regression object is to plot the predicted
values against the inputs.
You should be looking for the "predict" functions in whatever
(unstated) package you are using.
3. if I use GAM to create an equation with smoothing function
For example: y<-gam(a~s(b)+s(c),family=gaussian (link=log),Data)
how to get the coefficient of s(b) , s(c)
Again:
?predict
You can also look at the fit object with str() but from your other
questions and apparent difficulties, I am guessing that may be "too
much information".
My final target is getting the GAM equation to predict a, so I need
to know
how to get the coefficient of equation and how to write the
equation!!!
Spline fits will generally be complex curves and graphical output is
usually the way to evaluate and display the results. There will not be
a single coefficient that you can point to and say "that" is the effect.
As I know, I'm silly to ask these questions. But GAM is very
difficult to
me. From now on, I need to clear the concept of GAM.
Get a good book and read more.
Thank YOU!
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