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On 12/15/06, RMan54 <[e-mail]> wrote:
>
> This should be simple but I am struggling. I like to easily switch in xyplot
> between a linear or logarithmic y-axis by setting a logical flag logY to
> False or True. This switch changes the scales argument of xyplot. I found
> out that the original two-dimentional data (Conc vs Time in my case) are
> converted to log10(Conc) if log=TRUE in scales, but it appears that
> functions like panel.curve need to provide the y values in log10 form (if
> there is an automatic method, I would like to know). I therefore like to
> pass on the value logY to my custom panel.curve function. How do I do that?
> I think that the value of logY should go into xyplot that should pass it on
> to the panel function and then to the panel.curve function.

It probably should, but doesn't.

-Deepayan

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From [e-mail] Tue Mar 04 03:33:20 2003
From: "BRENDAN KLICK" <[e-mail]>
Subject: DF for GAM function (mgcv package)
Date: Fri, 15 Dec 2006 17:38:26 -0500
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For summary(GAM) in the mgcv package smooth the degrees of freedom for
the F value for test of smooth terms are the rank of covariance matrix
of \hat{beta} and the residuals df.  I've noticed that in a lot of GAMs
I've fit the rank of the covariance turns out to be 9.  In Simon Wood's
book, the rank of covariance matrix is usually either 9 or 99 (pages
239-230 and 259).  
 
Can anyone comment on why so many smooth terms have a denominator
degree of freedom involving 9.  Simon Wood writes "r is usually
determinted numerically, while forming the pseudoinverse of the
covariance matrix, or with reference to the effective degrees of freedom
of the term" which doesn't really clarify the issue for me at least.
 
Thanks.
 
Brendan Klick
Johns Hopkins University School of Medicine.

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From [e-mail] Tue Mar 04 03:33:20 2003
From: RMan54 <[e-mail]>
Subject: Re: xyplot: logarithmic y-axis
Date: Fri, 15 Dec 2006 14:41:49 -0800 (PST)
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Please take no offence since none was intended. What I meant is that it
should be simple for me to know how to do this but it isn't because of my
inexperience. I  think that the lattice package is great.

However, how can I pass on my own varaibles through xyplot?

Thanks, -Rene


Deepayan Sarkar wrote:
> 
> On 12/15/06, RMan54 <[e-mail]> wrote:
>>
>> This should be simple but I am struggling. I like to easily switch in
>> xyplot
>> between a linear or logarithmic y-axis by setting a logical flag logY to
>> False or True. This switch changes the scales argument of xyplot. I found
>> out that the original two-dimentional data (Conc vs Time in my case) are
>> converted to log10(Conc) if log=TRUE in scales, but it appears that
>> functions like panel.curve need to provide the y values in log10 form (if
>> there is an automatic method, I would like to know). I therefore like to
>> pass on the value logY to my custom panel.curve function. How do I do
>> that?
>> I think that the value of logY should go into xyplot that should pass it
>> on
>> to the panel function and then to the panel.curve function.
> 
> It probably should, but doesn't.
> 
> -Deepayan
> 
> ______________________________________________
> [e-mail] 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.
> 
> 

-- 
View this message in context: http://www.nabble.com/xyplot%3A-logarithmic-y-axis-tf2829755.html#a7900634
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From [e-mail] Tue Mar 04 03:33:20 2003
From: "Deepayan Sarkar" <[e-mail]>
Subject: Re: xyplot: logarithmic y-axis
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On 12/15/06, RMan54 <[e-mail]> wrote:
>
> Please take no offence since none was intended. What I meant is that it
> should be simple for me to know how to do this but it isn't because of my
> inexperience. I  think that the lattice package is great.

I didn't mean to suggest that I was offended. I only agreed with you
that it would be nice if there were a way of knowing inside the panel
function whether a log scale is being used, and informing you that
there isn't.

> However, how can I pass on my own varaibles through xyplot?

Any arguments not recognized by xyplot will be passed to the panel function.

-Deepayan

>
> Thanks, -Rene
>
>
> Deepayan Sarkar wrote:
> >
> > On 12/15/06, RMan54 <[e-mail]> wrote:
> >>
> >> This should be simple but I am struggling. I like to easily switch in
> >> xyplot
> >> between a linear or logarithmic y-axis by setting a logical flag logY to
> >> False or True. This switch changes the scales argument of xyplot. I found
> >> out that the original two-dimentional data (Conc vs Time in my case) are
> >> converted to log10(Conc) if log=TRUE in scales, but it appears that
> >> functions like panel.curve need to provide the y values in log10 form (if
> >> there is an automatic method, I would like to know). I therefore like to