Thank you for replying! I'll try to attach an image of some of my data, so you will see the structure. I want to run some regressions with the natural log of the difference, so I guess the first step would be to extract the change between each date? I'm almost completely new to R, and would appreciate any tips on how to proceed. <http://r.789695.n4.nabble.com/file/t386157/data-img.png>
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