5 messages · Philip Wong, Ista Zahn, John Kane +2 more
hello, I've two questions today. 1) I'm trying to do a scree diagram, I did a Google for a specific command I could used to do so. All I could find is a screeplot. Are they the same command? 2) what command can I used to present a PC scores, eigenvectors of the PC scores, and component correlations? thanks!
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Hi Phillip, I've never heard of a scree _diagram_, I'm not even sure what that is. To get started with principal components analysis in R, I suggest the psych package. The package vignettes are quite detailed, I suggest starting there. Best, Ista
hello, I've two questions today. 1) I'm trying to do a scree diagram, I did a Google for a specific command I could used to do so. ?All I could find is a screeplot. ?Are they the same command? 2) what command can I used to present a PC scores, eigenvectors of the PC scores, and component correlations? thanks! -- View this message in context: http://r.789695.n4.nabble.com/Scree-diagram-tp2122453p2122453.html Sent from the R help mailing list archive at Nabble.com.
______________________________________________ R-help at 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.
Ista Zahn Graduate student University of Rochester Department of Clinical and Social Psychology http://yourpsyche.org
Presumably, a scree plot? Philip may find something useful here http://www.statmethods.net/advstats/factor.html
From: Ista Zahn <istazahn at gmail.com> Subject: Re: [R] Scree diagram, To: "Philip Wong" <tombfighter at mysinamail.com> Cc: r-help at r-project.org Received: Sunday, May 2, 2010, 10:51 AM Hi Phillip, I've never heard of a scree _diagram_, I'm not even sure what that is. To get started with principal components analysis in R, I suggest the psych package. The package vignettes are quite detailed, I suggest starting there. Best, Ista On Sun, May 2, 2010 at 12:06 AM, Philip Wong <tombfighter at mysinamail.com> wrote:
hello, I've two questions today. 1) I'm trying to do a scree diagram, I did a Google
for a specific command I
could used to do so. ?All I could find is a
screeplot. ?Are they the same
command? 2) what command can I used to present a PC scores,
eigenvectors of the PC
scores, and component correlations? thanks! -- View this message in context: http://r.789695.n4.nabble.com/Scree-diagram-tp2122453p2122453.html Sent from the R help mailing list archive at
Nabble.com.
______________________________________________ R-help at 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.
-- Ista Zahn Graduate student University of Rochester Department of Clinical and Social Psychology http://yourpsyche.org
______________________________________________ R-help at 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.
1) I believe you wanted a scree plot which shows the percentage of variance explained (y-axis) versus the principal components (x-axis). To do that, all you needs a simple plot(x,y) function where x = pc and y = variance. It is called a scree plot because the plot looks like a scree on the side of the mountain. 2) you can find the details of the components using names(x) where x= the output from your pca command Muhammad
hello, I've two questions today. 1) I'm trying to do a scree diagram, I did a Google for a specific command I could used to do so. All I could find is a screeplot. Are they the same command? 2) what command can I used to present a PC scores, eigenvectors of the PC scores, and component correlations? thanks!
There is a screeplot() function that takes the output from prcomp. It plots the value of the eigenvalue vs. the eigenvalue's number. CS ----- Corey Sparks, PhD Assistant Professor Department of Demography and Organization Studies University of Texas at San Antonio 501 West Durango Blvd Monterey Building 2.270C San Antonio, TX 78207 210-458-3166 corey.sparks 'at' utsa.edu https://rowdyspace.utsa.edu/users/ozd504/www/index.htm
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