R help - Jul 2009 - local regression using loess

Hi, All,

I have a dataset with binary response ( 0 and 1) and some numerical
covariates. I know I can use logistic regression to fit the data. But I want
to consider more locally. So I am wondering how can I fit the data with
'loess' function in R? And what will be the response: 0/1 or the
probability
in either group like in logistic regression?

Thank you,
Cindy

	[[alternative HTML version deleted]]

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On
Behalf Of cindy Guo
Sent: Monday, July 27, 2009 4:06 PM
To: r-help at r-project.org
Subject: [R] local regression using loess

Hi, All,

I have a dataset with binary response ( 0 and 1) and some numerical
covariates. I know I can use logistic regression to fit the data. But I want
to consider more locally. So I am wondering how can I fit the data with
'loess' function in R? And what will be the response: 0/1 or the
probability
in either group like in logistic regression?

-- Neither. Loess is an algorithm that smoothly "interpolates" the
data. It
makes no claim of modeling the probability for a binary response variable. 

-- Bert Gunter
Genentech Nonclinical Statistics

Thank you,
Cindy

	[[alternative HTML version deleted]]

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

cindy Guo wrote:
> 
> Hi, All,
> 
> I have a dataset with binary response ( 0 and 1) and some numerical
> covariates. I know I can use logistic regression to fit the data. But I
> want
> to consider more locally. So I am wondering how can I fit the data with
> 'loess' function in R? And what will be the response: 0/1 or the
> probability
> in either group like in logistic regression?
> 
> Thank you,
> Cindy
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
> 

Why don't you fit a GAM with a logistic link function and binomial
distirbution?

Alain


-----
--------------------------------------------------------------------
Dr. Alain F. Zuur
First author of:

1. Analysing Ecological Data (2007).
Zuur, AF, Ieno, EN and Smith, GM. Springer. 680 p.

2. Mixed effects models and extensions in ecology with R. (2009).
Zuur, AF, Ieno, EN, Walker, N, Saveliev, AA, and Smith, GM. Springer.

3. A Beginner's Guide to R (2009).
Zuur, AF, Ieno, EN, Meesters, EHWG. Springer


Statistical consultancy, courses, data analysis and software
Highland Statistics Ltd.
6 Laverock road
UK - AB41 6FN Newburgh
Email: highstat at highstat.com
URL: www.highstat.com



-- 
View this message in context:
http://www.nabble.com/local-regression-using-loess-tp24689834p24696908.html
Sent from the R help mailing list archive at Nabble.com.