Hi Melissa, so what you want to calculate is something like
S<-cumsum(lambs)-(1:length(lambs))*mean(lambs) since (with x.bar=mean(x)) S_1=x_1-x.bar S_2=S1+(x_2-x.bar)=x_1-x.bar+x_2-x_bar=x_1+x_2-2*x.bar ... S_n=S_(n-1)+x_n-x.bar=sum_i (x_i)-n*x.bar Eik. m.mcquil...@lancaster.ac.uk schrieb:
Hi, I am trying to perform a change point analysis. I know there is a function that does this but I am just out of university on an internship so they are trying to make me do it myself using this website : http://www.variation.com/cpa/tech/changepoint.html So if you look for CUMSUM on this you will see what I am trying to do but I'm not having much success! Melissa
-- Eik Vettorazzi Institut für Medizinische Biometrie und Epidemiologie Universitätsklinikum Hamburg-Eppendorf Martinistr. 52 20246 Hamburg T ++49/40/42803-8243 F ++49/40/42803-7790 ______________________________________________ R-help@r-project.org mailing list 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.
