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October 18th, 2018, 09:09 AM   #1
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Correlogram

What is the significance of a correlogram? I am confused over the terms cross-correlation and correlogram. They are the same thing, right?

Let's say there is a plot of correlogram as attached.

What can we comment about it? The x axis is the time whereas the y axis is the correlation between 2 variables, say temperature and rainfall. How does the correlogram give information between the 2 variables?

I notice a sinusoidal pattern in the plot.

Any input/discussion is appreciated!
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October 18th, 2018, 02:26 PM   #2
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https://en.wikipedia.org/wiki/Correlogram

correlogram is the plot of the data
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October 18th, 2018, 05:48 PM   #3
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Thank you for the input. What is the significance of the shape of the correlogram though? Comparing that of what I have posted (which is not autocorrelation) versus the wiki link, which is the autocorrelation, there seems to be a difference in pattern...
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