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ddev
2007 Oct 08
2
variance explained by each term in a GAM
...th (edf), but (as far as I understand) there is no information on the proportion of variance explained.
One alternative may be to fit alternative models without each term, and calculate the reduction in deviance. For example:
m1=gam(y~s(x1) + s(x2)) # Full model
m2=gam(y~s(x2))
m3=gam(y~s(x1))
ddev1=deviance(m1)-deviance(m2)
ddev2=deviance(m1)-deviance(m3)
Here, ddev1 would measure the relative proportion of the variability in y explained by x1, and ddev2 would do the same for x2. Does this sound like an appropriate approach?
Julian
Julian Burgos
FAR lab
University of Washington
2011 Mar 11
0
variance explained by each term in a GAM
...riance explained.
>>
>> One alternative may be to fit alternative models without each term, and
>> calculate the reduction in deviance. For example:
>>
>> m1=gam(y~s(x1) + s(x2)) # Full model
>> m2=gam(y~s(x2))
>> m3=gam(y~s(x1))
>>
>> ddev1=deviance(m1)-deviance(m2)
>> ddev2=deviance(m1)-deviance(m3)
>>
>> Here, ddev1 would measure the relative proportion of the variability in y
>> explained by x1, and ddev2 would do the same for x2. Does this sound like
>> an appropriate approach?
>>
>&g...