Yamamoto test in BreakPoints package
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 at 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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______________________________________________ R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.