[R] Help with Lowess smoother

[peter dalgaard]

> On 26 Oct 2014, at 21:51 , Don McKenzie <dmck at u.washington.edu> wrote:
> 
>> 
>> On Oct 26, 2014, at 1:45 PM, Evan Kransdorf <evan.kransdorf at gmail.com> wrote:
>> 
>> Hello,
>> 
>> I'm trying to use Lowess smooters to plot some data for regression
>> analyses.  When I do with certain variables, I get the following error:
>> 
>>> plot(lowess(data$V1,data$V2))
>> Error in lowess(data$V1, data$V2) : 'delta' must be finite and > 0
>> 
>> Does anyone know where the problem is?  I suspect there's a problem with my
>> data somewhere.
> 
> That sounds like a good guess, but without a reproducible example, no one can say for sure.

Well, given that delta is an unspecified argument and that its default, which the poster might have looked up, is diff(range(x)), the poster might have suspected that perhaps the range of x, i.e. data$V1, is either 0 or non-finite. In the former case, all values of x are identical, in the latter, there are Inf or NA values among them. Either way, summary(data$V1) should be enlightening. 


>> 
>> Many thanks!
>> 
>> 	[[alternative HTML version deleted]]
>> 
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>> and provide commented, minimal, self-contained, reproducible code.
> 
> Don McKenzie
> Research Ecologist
> Pacific Wildland Fire Sciences Lab
> US Forest Service
> 
> Affiliate Faculty
> School of Environmental and Forest Sciences
> University of Washington
> dmck at uw.edu
> 
> ______________________________________________
> 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.

-- 
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com