[rrd-users] Practical uses for LSLCORREL?
Diego M. Vadell
dvadell at linuxclusters.com.ar
Wed Jan 30 16:29:02 CET 2008
I was thinking about finding the correlation between two different
datasources, and after a little browsing I got back to the rrrdtool home
page, where it says:
"LSLCORREL is the Correlation Coefficient (also know as Pearson's Product
Moment Correlation Coefficient). It will range from 0 to +/-1 and represents
the quality of fit for the approximation."
As far as I understand, rrdtool calculates the Least Square Line to
approximate the value, and LSLCORREL is how good the approximation is. Like a
measure of the confidence in the LSL approximation.
More browsing led me to the wikipedia:
"In statistics, the Pearson product-moment correlation coefficient (sometimes
referred to as the MCV or PMCC) (r) is a common measure of the correlation
between two variables X and Y. "
So everything has sense, except that its not what I was looking for :)
Three questions then:
* Am I right? Have I missed something?
* What is a practical use of LSLCORREL? In fact, why would I want to
approximate the data?
* Is there a way to do what I want (find the correlation - e.g. the person's
PMCC - of two datasources)?
Thanks a lot in advance,
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