I'm beginning to be skeptical about research that tries to show that basic moral orientations, personality types, or even genes correspond to liberal, conservative, and libertarian.
Looking historically and globally, not all political party conflicts aligned as "left" and "right," and the idea of a distinctively libertarian ideology, neither left nor right, is probably no more than fifty years old. Tories vs. Whigs might be called a left/right split. But what about Jacobins and Girondins? Federalists and Anti-Federalists? 19th-century Democrats and Republicans?
If there are fundamental categories distinguishing different kinds of human personalities, and if they're supposed to explain political views, then it's a problem if they only explain current (and predominantly American) political views.
the idea of a distinctively libertarian ideology, neither left nor right, is probably no more than fifty years old.
Libertarian is largely just a more extreme, less left and more right leaning version of what's called liberal in Europe, isn't it? Liberal parties go back quite a bit longer than fifty years.
Jonathan Haidt, a professor at UVA, runs an online lab with quizzes that will compare your moral values to the rest of the population. I have found the test results useful for avoiding the typical mind fallacy. When someone disagrees with me on a belief/opinion I feel certain about, it's often difficult to tease apart how much of this disagreement stems from them not "getting it", and how much stems from them having a different fundamental value system. One of the tests alerted me that I am an outlier in certain aspects of how I judge morality (green = me; blue = liberals; red = conservatives):
Another benefit of these quizzes is that they can point out potential blind spots. For example, one quiz asks for opinions about punishment for crimes. If I discover I'm an outlier w.r.t. the population, I should reconsider whether my opinions are based on solid evidence (or did I see one study that found tit-for-tat punishment effective in a certain context, and take that as gospel?).
Extra reading: Haidt wrote a WSJ article last month that applied the learnings of these moral quizzes to better understanding the Tea Party.