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This is a very simple question. I am interpolating annual data using the fetch command, conversion = cubic (c=c) Is this the equivalent of a cubic spline, and if not, is there an alternative code? for %a 01 04 06 08 09 10 11 14 15 17 19 20 21 22 23 24 25 26 27 fetch(d="U:\Departments\Economics\...