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 > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@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. > [[alternative HTML version deleted]] ______________________________________________ R-help@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.
