As an aside, one metric having to do with publication that is commonly used is the 'impact factor.' Although this number is meant to evaluate journals as a whole, it is often used by institutions to evaluate researchers, using the journals in which they publish as a proxy for their overall impact as scientists. This is, of course, highly controversial. One aspect that makes it even more problematic is that metrics like impact factor can be highly dependent on the database used for compiling the raw citation data. My wife published a paper a few years back in which this issue was explored quantitatively (Gray & Hodkinson 2008). In a set of 50 journals, many rankings were seen to differ by numbers that ran up into the double digits depending on the database used, calling into question the accuracy of any given journal's impact factor.
Gray, E, and S. Z. Hodkinson. 2008. Comparison of Journal Citation Reports and Scopus Impact Factors for Ecology and Environmental Sciences Journals. Issues in Science and Technology Librarianship DOI:10.5062/F4FF3Q9G.
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