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I am wondering about something. I know I should write function non-italic. like sin and cos, But I am not sure if test statistic symbols like $T^2$ should be written italic (default) or with \mathrm.

for example: $T^2$-Hotelling's is correct or $\mathrm{T}^2$-Hotellings?

Any help will be appreciated.

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    Speaking purely for myself (I'm an econometrician...), I would choose the first version, i.e., $T^2$. However, what matters most is notational consistency: Use either $T^2$ or $\mathrm{T}^2$ consistently, and your readers won't get confused. – Mico Jan 7 '18 at 22:57
  • Thanks @Mico. I Saw in articles that using the first version, But because test statistics are a type functions it made me confused. Anyway I think you right. consistency is matters. – SirSaleh Jan 7 '18 at 23:00
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    I agree with @Mico. This is e.g. what the APA requires. – Alan Munn Jan 7 '18 at 23:11
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    Do \newcommand{\Tsq}{T^2} in your preamble and use $\Tsq$-Hotellings. This way you can change the output by simply modifying the definition. – egreg Jan 7 '18 at 23:52
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    This is really off-topic because it is not about a TeX issue. If the question was, 'I need T to be upright, but it comes out italic - how can I correct this?' then it would be on-topic. But 'should it be upright or italic?' is off-topic. How to implement things is on-topic. Whether they should be implemented is generally not. – cfr Jan 8 '18 at 3:04

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