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I want to see the correlation matrix for more than 100 variables. When I select all of them, open as group and show the correlation matrix the correlation is different than as if I only choose two variables. The values differ significantly which makes an analysis impossible. Am I missing out on some...

I have two different data sets in two excel files. In each of the excel files the first column marks the date of the observation and the second column the associated observed value. Both data sets include different dates. Most dates are in common, however, there are some dates missing in the first f...