Dear Newmiller, Thank you for your reply. I’ve just posted the same question in the another forum for stats as you suggested.
Meanwhile, I would like to keep the question submitted to learn from R users, if it is available . Park On Sun, May 9, 2021 at 6:01 AM Jeff Newmiller <jdnew...@dcn.davis.ca.us> wrote: > This not being a question about R, but rather about statistics, or > possibly about a contributed package, means (per the Posting Guide) that > you should be asking in a statistics forum like stats.stackexchange.com > or corresponding with the author of the package in question. If you are > lucky someone here will have something to offer, but it is not very likely. > > On May 8, 2021 3:05:12 AM PDT, Hyun Soo Park <hy...@snu.ac.kr> wrote: > >Dear R users, > > > >I want to find the latent factors from a kind of time-series data > >describing temporal changes of concentration using a factor analysis > >technique called 'factor analysis of dynamic structure (FADS).' I > >learned > >how to form the data for the analysis using a proper package embedding > >FADS, such as 'fad' package. > > > >The analysis with 'fad' worked and gave me results, but the problem was > >raised when the time-series data is vast. > > > >The time-series data extracted from the 3-dimensional matrix (i.e., 3D > >image volume of 50 x 50 x 163) repeatedly acquired at 54-time points is > >consisted of 50 x 50 x 163 x 54 = 22,005,000 observations. The desired > >number of the latent factor (k) is 4. What I got from fad(MATRIX, k) is > >following: > > > >Error in fun(A, k, nu, nv, opts, mattype = "matrix") : > > TridiagEigen: eigen decomposition failed > > > >When I resize the matrix smaller into 5 x 5 x 15, it gives me what I > >wanted > >properly. > > > >I found that some resampling methods such as random sampling, data > >stratification, etc., could resolve this kind of problem, but I have no > >ideas which one could be appropriate. > > > >Please teach me with any ideas and comments. > > > >Thanks in advance, > > > >Park > > -- > Sent from my phone. Please excuse my brevity. > -- *연구중점교수, 분당서울대학교병원* *전화번호:* (사무실) +82-31-787-2936 (휴대전화) +82-10-8833-2806 *팩스:* +82-31-787-4018 *이메일:* hy...@snu.ac.kr *Hyun Soo Park, PhD* *--* *Research professor* Department of Nuclear Medicine Seoul National University Bundang Hospital, Seongnam, Korea *Telephone:* (Office) +82-31-787-2936 (Mobile) +82-10-8833-2806 *Fax:* +82-31-787-4018 *email:* hy...@snu.ac.kr [[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.