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RE: st: query regarding thin plate spline method


From   Nick Cox <n.j.cox@durham.ac.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   RE: st: query regarding thin plate spline method
Date   Tue, 6 Dec 2011 12:15:52 +0000

I don't think -thinplate- promises any where to give you the interpolations as data. It seems that you would have to write your own code using the basis functions, or hack at the graph code to output what it shows. Stas Kolenikov is a member of this list and presumably he is able to say more. But it seems that this is a program he wrote some years ago and is not maintaining. 

Nick 
n.j.cox@durham.ac.uk 

behailu ayele

Dear Nick

Thanks so much . As usual your suggestions helped. Thinplate is
running but like you said, it is generating me graphs and not giving
me the interpoliated figures I am looking for.

My reason for using the thinplate method is because I am using climate
data from several stattions and the papers that use similar data say
they use the thin plate spline method to interpoliate climate data
from meteorological stations into farm level observations.

It would be great if you or anybody in the list could help me
understand how the thin plate spline method that I am using right now
enables me do that.


On 12/6/11, Nick Cox <njcoxstata@gmail.com> wrote:
> -thinplate- is a program by Stas Kolenikov available from his website.
> You are asked to explain where user-written programs you refer to come
> from.
>
> Your two problems are that you have installed -thinplate- but Stata
> cannot find it, and that you have run -thinplate- but see no results.
> The first is difficult to comment on as you say nothing about how you
> installed it and where.
>
> Either way,
>
> 1. -thinplate- says it is for smoothing, but you say you want interpolation.
>
> 2. -thinplate- gives a complete example in its help. You should be
> able to test your installation by running that example.
>
> 3. -thinplate- is for Stata 7 and runs old-style graphics.
>
> 4. For your second problem the advice in the Statalist FAQ applies as usual.
>
> "Say exactly what you typed and exactly what Stata typed (or did) in
> response. N.B. exactly! If you can, reproduce the error with one of
> Stata's provided datasets or a simple concocted dataset that you
> include in your posting."
>
> 5. Stata 12 includes contouring based on thin plate splines. See
>
> http://www.stata.com/help.cgi?twoway_contour
>
> Conversely, if you are not using Stata 12, the FAQ advises you to make
> that clear.
>
> Nick
>
> On Tue, Dec 6, 2011 at 9:27 AM, behailu ayele <bbezabih@googlemail.com>
> wrote:
>
>> I am trying to do interpoliations to my climate data using the thin
>> plate spline method. I searched in statalist and I found an ado file
>> for that (which I paste below). I have now faced two problems: when I
>> install THINPLATE and try to recall it in stata, I get error message
>> saying THINPLATE is not found. The second problem is when I just copy
>> the ado file and run it straigt in stata, the lines run fine but I get
>> no output. My programming knowledge in stata is  poor so any help on
>> this is much appreciated.
>>
>> Also if there are easier ways of doing interpoliations in stata, you
>> may sugget them to me as well.
>
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