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Jul 20, 2013 at 22:00 vote accept Dimitrie Mihes
Jul 20, 2013 at 21:59 comment added Dimitrie Mihes 0 is the true value, as no. of articles is a proxy for issue salience. A negative value would have no substantive interpretation (it cannot decrease issue awareness, only not provide any).Concerning the 2nd question, I assume linearity mainly because previous literature models it this way, although I came across some who recommend logging it. I don't see this as a viable method, as I end up with a lot of missing values. Moreover, by looking at the above threads, adding a constant isn't an option either. Using the sqrt seems to approach a linear relationship, but still leaves the 0s.
Jul 20, 2013 at 1:16 history edited Peter Ellis CC BY-SA 3.0
added 15 characters in body
Jul 20, 2013 at 0:23 history answered Peter Ellis CC BY-SA 3.0