Even in R, there are so many of "robust PCA"... any survey or review of all
these different methods?
On Sun, Apr 22, 2012 at 6:58 PM, Joshua Wiley <jwiley.ps...@gmail.com>wrote:
> On Sun, Apr 22, 2012 at 4:43 PM, Michael <comtech....@gmail.com> wrote:
> > I actually tried "robustPca" in "pcaMethods" on bioconductor.
> >
> > It keeps giving me the warning "Input data is not complete"...
> >
> > Reading into the function:
> >
> > When there is no "NA"s, it will give this warning...
> >
> > It seems that there is a bug in this code...
> >
> > Is it reliable at all?
> >
> > ---------------------
> >
> >
> >> robustPcafunction (Matrix, nPcs = 2, verbose = interactive(), ...)
> > {
> > nas <- is.na(Matrix)
> > if (!any(nas) & verbose) {
> > cat("Input data is not complete.\n")
> > cat("Scores, R2 and R2cum may be inaccurate, handle with care\n")
> > }
>
> that seems to issue the notes when there are *not any missing* and
> verbose is TRUE. I would submit a bug report to the author.
>
> >
> >
> >
> >
> >
> > On Fri, Apr 20, 2012 at 9:58 AM, Kevin Wright <kw.s...@gmail.com> wrote:
> >
> >> You can also have a look at the pcaMethods package on Bioconductor.
> >>
> >> Kevin
> >>
> >>
> >> On Thu, Apr 19, 2012 at 11:20 PM, Michael <comtech....@gmail.com>
> wrote:
> >>
> >>> Hi all,
> >>>
> >>> I found that the PCA gave chaotic results when there are big changes
> in a
> >>> few data points.
> >>>
> >>> Are there "improved" versions of PCA in R that can help with this
> problem?
> >>>
> >>> Please give me some pointers...
> >>>
> >>> Thank you!
> >>>
> >>> [[alternative HTML version deleted]]
> >>>
> >>> ______________________________________________
> >>> 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<http://www.r-project.org/posting-guide.html>
> <http://www.r-project.org/posting-guide.html>
> >>> and provide commented, minimal, self-contained, reproducible code.
> >>>
> >>
> >>
> >>
> >> --
> >> Kevin Wright
> >>
> >>
> >
> > [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > 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<http://www.r-project.org/posting-guide.html>
> > and provide commented, minimal, self-contained, reproducible code.
>
>
>
> --
> Joshua Wiley
> Ph.D. Student, Health Psychology
> Programmer Analyst II, Statistical Consulting Group
> University of California, Los Angeles
> https://joshuawiley.com/
>
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