3

I want to make the following in-text formula and I am a LaTeX beginner:

 \begin{math}$ES_{\alpha}$=$-E[R|R≤-$VaR_\alpha$]$\end{math}. 

I do, however keep getting this message:

! Missing $ inserted. 
<inserted text>
            $
1.29...in {math}$$ES_{\alpha}$= -E [$R|R≤- $VaR_\alpha$]$\end{math}.The a.....

I have already tried to alter the position of $ multiple times. Could someone perhaps explain in which cases is a $ needed, except for subscript and superscript because that part is clear to me. I am interested in the use of $ in the in-text mathematical equations in general.

  • 3
    \begin{math} is an alternative to $ use one or the other not both, just remove all the $ from your example. – David Carlisle May 11 '17 at 11:16
  • 1
    Why not just $ES_{\alpha} = -E[R|R≤- VaR_\alpha ]$ ? – Steven B. Segletes May 11 '17 at 11:17
  • @StevenB.Segletes \mathrm{Var} – David Carlisle May 11 '17 at 11:17
  • What he said!... ($ES_{\alpha} = -E[R|R≤- \mathrm{Var}_\alpha ]$) – Steven B. Segletes May 11 '17 at 11:18
4

Assuming that ES and VaR are acronyms that stand for "expected shortfall" and "Value at Risk", respectively, I would write the expression as follows:

$\mathrm{ES}_{\alpha}=-\E[\,R\mid R\le-\mathrm{VaR}_\alpha\,]$

Here, \E is a macro that denotes the expectation operator. Observe that you should enter and exit math mode only one time each.

A full MWE:

enter image description here

\documentclass{article}
\usepackage{amsmath}
\DeclareMathOperator{\E}{E} % expectation operator
\begin{document}
$\mathrm{ES}_{\alpha}=-\E[\,R\mid R\le-\mathrm{VaR}_\alpha\,]$
\end{document} 

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