<p>Well, I've never said that specific majors don't have advantages or disadvantages, only that whatever they may be, they seem to cancel each other out.</p>
<p>The example I like is this. Majoring in English is generally considered easier than majoring in Chemistry, and so an English major probably has a higher GPA. Reading comprehension is by far the most important element of the MCAT, and so English majors probably score a little bit higher on the MCAT too. (This last bit is confirmed.) However, English majors also have less access to research and their advanced science coursework might be a little lacking.</p>
<p>That's not to say that specific advantages and disadvantages don't exist -- only that they cancel out in the end. In other words, major may provide a gross advantage, but not a net one.</p>
<p>Two more caveats. If you see the data, you'll notice that majors are broken up into pretty broad categories. Within any given category, it's possible that some majors are preferred. For example, social sciences vs. physical sciences -- no advantage.</p>
<p>But maybe Sociology has an advantage over Economics. This would be ridiculous, of course. If Chemistry, Biology, Social Sciences, and Humanities are all the same, can it really be possible that some social sciences are at a disadvantage relative to others? Doubtful. But I don't have the data to disprove that.</p>
<p>There's a second possibility. It's possible that some schools prefer certain majors -- and that other schools cancel them out. For example, Case is known to prefer non-science majors. Since medical schools on balance do not prefer non-science majors, it must be that there's another school-equivalent which prefers science majors just as much as Case. (It might be two schools which demonstrate half the preference, etc.)</p>
<p>Again, I think that's a silly thing to worry about, because Case is the only school I've ever heard to state a preference. (If you have your heart set on Case, however, it might be important.) But just to make clear again, majors may provide gross advantages. It's just that all of them cancel out so that in the end, no major has a net advantage.</p>
<p>One final qualification. The AAMC gives no data on incoming SAT score and HSGPA for the different majors -- which means that it's possible that all the stupid kids flock to social sciences while all the bright ones flock to biology. If that's the case, then you want to follow the stupid kids, since their performance in the end seems to be about equivalent.</p>