[R] locfit smoothing question (package maintainer not reachable)
Suresh Krishna
madzientist at gmail.com
Wed Mar 4 13:41:28 CET 2009
On Tue, 03 Mar 2009 22:10:42 +0100, David Winsemius
<dwinsemius at comcast.net> wrote:
> That is what I thought to be the critical paragraph. The variance is
> assumed to be = 1 when you use family="gaussian" rather than the default
> of family="qgauss". You give it a vector, 1000*rnorm(100), that ranges
> widely and a small (relative) variance is assumed and so the confidence
> intervals are plotted as very narrow. This does not seem surprising
> given the functions documented design. I have the book and do not think
> I even need to pull it off the shelf since the help pages appear fully
> informative in this instance. I get an rv of 1 with the "gaussian"
> option and an rv of nearly 1000 when the default is used.
>
Thank you, that is helpful. I guess I am wondering under what circumstance
would it be appropriate to assume that the data had a variance of 1 and
use the family=gaussian option. Perhaps this is for normalized data ?
Suresh
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