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 <nickmw...@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
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and provide commented, minimal, self-contained, reproducible code.
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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