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<p>It may be laborious, but you can use each school’s common data set, section J, to estimate the number of students in each group of majors (biological sciences, physics sciences, math and statistics, engineering, and computer science) at the school in order to recalculate an estimate of PhD production based on the in-major population at the undergraduate school. However, that has limitations in terms of specific majors within the major groups (e.g. marine biology, geophysics, or materials engineering).</p>
<p>In any case, a student with focused interests (like the OP) should look carefully at any school to determine whether the school has suitable offerings for his/her focused interests. Yes, many students do change major or focus within a major, so it is a good idea to also consider the offerings in other subjects that the student may change into.</p>