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In each of the last five years, a few dozen empirical studies appeared invisualization journals and conferences. The existing empirical studies havealready featured a large number of variables. There are many more variables yetto be studied. While empirical studies enable us to obtain knowledge andinsight about visualization processes through observation and analysis of userexperience, it seems to be a stupendous challenge for exploring such a hugevariable space at the current pace. In this position paper, we discuss theimplication of not being able to explore this space effectively andefficiently, and propose means for addressing this challenge.

The Huge Variable Space in Empirical Studies for Visualization -- A Challenge as well as an opportunity for Visualization Psychology