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Explanation: Yes, I agree with Robert Kerns that the placement of the variable name depends on the context. Placing the name after is more formal and implies no familiarity with the variable under discussion. One can talk about the X variable plotted along the X-axis, but one would list the X variable as variable X. The same would apply for factors, variants, determinants, etc.
R. A. Stegemann Saudi Arabia Local time: 07:31 Native speaker of: English PRO pts in pair: 285