[R] Yamamoto test in BreakPoints package

[Ben Bolker]

   Maybe contact the package maintainer (maintainer("BreakPoints")) and 
ask?  (Normally I avoid bugging package maintainers if I can, but it 
seems you've looked everywhere else you can ...)

   Ben Bolker

On 2023-10-19 4:18 a.m., Richard O'Keefe wrote:
> Visit the page at CRAN
> https://cran.r-project.org/web/packages/BreakPoints/index.html
> and download
> 
> BreakPoints_1.2.tar.gz
> <https://cran.r-project.org/src/contrib/BreakPoints_1.2.tar.gz>
> and you will find yamamoto.R in there.  Sadly, there are no
> useful comments in there.
> 
> <https://cran.r-project.org/src/contrib/BreakPoints_1.2.tar.gz>
> I tried example(yamamoto), and out of 4 actual break-points,
> it found 5 of them.  In another test, modelled on that
> example, it found 6 out of 3 actual breaks.
> 
> On Thu, 19 Oct 2023 at 20:30, Nick Wray <nickmwray using gmail.com> wrote:
> 
>> Hello I’m not sure whether this strictly speaking counts as an R-help query
>> but anyway…  I have been using the Yamamoto test in the BreakPoints package
>> to find breakpoints in flow data for Scottish rivers.  However, I can’t
>> really just use the Yamamoto test as a “black box” ie data in, data out --
>> I need to find the actual algorithm which the Yamamoto test uses, either in
>> algebraic form or as R code, but despite exhaustive searching I can’t find
>> it.  I’ve tried to find a Github repository and various other things but
>> nothing comes up to give detailed information about the Yamamoto test as in
>> the package.  The original 1985 paper
>>
>>   Climatic Jump: A Hypothesis in Climate Diagnosis
>>
>> Ryozaburo Yamamoto
>> <
>> https://www.jstage.jst.go.jp/search/global/_search/-char/en?item=8&word=Ryozaburo+Yamamoto
>>>
>> , Tatsuya Iwashima
>> <
>> https://www.jstage.jst.go.jp/search/global/_search/-char/en?item=8&word=Tatsuya+Iwashima
>>>
>> , Sanga-Ngoie Kazadi
>> <
>> https://www.jstage.jst.go.jp/search/global/_search/-char/en?item=8&word=Sanga-Ngoie+Kazadi
>>>
>> , Makoto Hoshiai
>> <
>> https://www.jstage.jst.go.jp/search/global/_search/-char/en?item=8&word=Makoto+Hoshiai
>>>
>>
>>
>>
>>   which is cited on the CRAN R info BreakPoints: Identify Breakpoints in
>> Series of Data (r-project.org)
>> <https://cran.r-project.org/web/packages/BreakPoints/BreakPoints.pdf>
>> doesn’t give any details.
>>
>>
>> There is another paper by Yamamoto et al (1987) Proc. NIPR Symp. Polar
>> Meteorol. Glaciol., 1, 91-102, 1987 but the method is not very clear and
>> whether it’s actually what the package does I can’t tell.
>>
>> There is info about a Toda-Yamamoto causality test but this doesn’t seem to
>> be the same thing as the Yamamoto test in the R package BreakPoints
>>
>> If anyone can point me to where either an algebraic algorithm or the R code
>> is I’d be v grateful
>>
>> Thanks Nick Wray
>>
>>          [[alternative HTML version deleted]]
>>
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> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
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