Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » Software » comp.soft-sys.matlab

Topic: princomp interpretation
Replies: 2   Last Post: Oct 5, 2011 3:14 PM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Marc Sean

Posts: 49
Registered: 8/19/10
princomp interpretation
Posted: Oct 4, 2011 3:17 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

Hi.
I've a data set comprised of 32 channels.
So I've a matrix of
32 x 100000
where 32 is the channels and 100000 are the data collected for each channel.

I'm trying to use principal component method to reduce the number of channels for my subsequent analysis.

I did this
[pc, scores, variance, t] = princomp (mydata);

From there, how do I decide which of the 32 channels do not contain enough information for me to spend time analyzing? Do I read the pc or scores or variance, or t value? I read the manual but it does not make much sense to me. And I'm running out of time to slowly dig through the maths behind it. Is there a proper way to decide which channel has enough information based on the info. I gather from the princomp?

Many thanks.
Marc



Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.