MATLAB: Can somebody help me to understand this cross correlation output

crosscorr

Hi!
I'm trying to find cross-correlation between rainfalls and rock fall events and in case, i want to know how many days are between the precipitation and the rock fall event.
At first examining the correlation between rainfall data and rock fall events in time the correlation coeff is pretty null (-0.0146).
Thank you all in advance

Best Answer

Hi,
In General, Cross correlation defines the similarity of signals (or vectors) as a function of a time-lag applied to one of the signals.
To comment on the output, it shows that at some lag period between 50 and 100 say "x", the cross correlation is high i.e., the 2 signals are strongly related (high measure of similarity) when one of the signals is shifted by "x".
Refer the following documentations for clear understanding of correlation with different examples:
https://www.mathworks.com/help/matlab/ref/xcorr.html
https://www.mathworks.com/help/dsp/ref/dsp.crosscorrelator-system-object.html
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