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I have two vectors of variables, $X$, and $\beta_0$ that I am writing about.

Each are indexed by $i=1,\ldots,n$

If I want to talk about $X_i$ and $\beta_{0_i}$, using \beta_{0_i}, the $i$ on the beta is too small to see. Even if I use \beta{_0}_i: $\beta{_0}_i$, the $0$ seems to get in the way of making a visual comparison. Is there any reason not to use $\beta_{0,i}$, since the $0$ is not really an index?

At this point, I am sure that I am over-thinking this, but before I go with $\beta_{0,i}$, I'd appreciate feedback - and other suggestions as well.

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    Do you mean $0$ (zero) or $o$ (oh)? The title and the post are inconsistent.2012-06-28
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    Honestly, I would suggest $(\beta_0)_i$.2012-06-28
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    @AsafKaragila I call it "beta naught", so I suppose "zero"2012-06-28
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    @ArturoMagidin I am reluctant to use that because it appears with too many other parentheses, such as $Var(g(\beta{_0}_i))$2012-06-28
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    Then I would suggest using the index as a superindex instead of a subindex (with suitable explanation ahead of time).2012-06-28

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