Vertically align text to fraction line in equation with nested fractions

Question

I am trying to get output that would look like this:

The MWE I attached works well for equations with non-nested fractions or without fractions.

The problem arises when I have equations with nested fractions. The text on the left is offset compared to the part of the equation before =. Is there a way to align "Calculation" with "ROIC Ticker" at their baseline?

\documentclass[fleqn, 10pt]{article}

\usepackage{mathtools}

\usepackage{fontspec}
\setmainfont{Source Sans Pro}

\usepackage{unicode-math}
\setmainfont{Asana Math}

\renewcommand{\baselinestretch}{1.25}
\setlength{\mathindent}{0pt}

\usepackage[margin=1in]{geometry}

\begin{document}

\setlength{\abovedisplayskip}{-\baselineskip}
\begin{minipage}[t]{.15\textwidth}
    \textbf{Calculation}\par
\end{minipage}
%
\begin{minipage}[t]{.85\textwidth}
    \begin{align}
        ROIC \ Ticker = \frac{e^{(\sum_{i=1}^{n}{\ln{(1+Daily \ Ticker \ Contribution)}}}-1}{\frac{\sum_{i=1}^{n}|Position \ Size \ (CPS)|}{n}} 
    \end{align}
\end{minipage}

\end{document}

Answer 1

1) use \setmathfont{Asana Math}, not \setmainfont.

2) Use alignat rather than two minipages, which align the tops of the minipages, not the top of the first minipage with with the first fraction line of the second minipage.

\documentclass[fleqn, 10pt]{article}

\usepackage{mathtools}

\usepackage{fontspec}
\setmainfont{Source Sans Pro}

\usepackage{unicode-math}
\setmathfont{Asana Math}

\renewcommand{\baselinestretch}{1.25}
\setlength{\mathindent}{0pt}

\usepackage[margin=1in]{geometry}

\begin{document}

    \begin{alignat}{2}
     & \textbf{Calculation} &\qquad \ ROIC \ Ticker & = \frac{e^{(\sum_{i=1}^{n}{\ln{(1+ Daily~Ticker~Contribution)}}}-1}{\frac{\sum_{i=1}^{n}\lvert Position~Size~(CPS)\rvert}{n}}
    \end{alignat}

\end{document} 

Answer 2

Put 'Calculation' inside the environment (which should be equation instead of align in my opinion since you're not aligning anything) without using minipages. AND use \setmathfont instead of \setmainfont for math.

\documentclass[fleqn, 10pt]{article}

\usepackage{mathtools}

\usepackage{fontspec}
\setmainfont{Source Sans Pro}

\usepackage{unicode-math}
\setmathfont{Asana Math}

\renewcommand{\baselinestretch}{1.25}
\setlength{\mathindent}{0pt}

\usepackage[margin=1in]{geometry}

\begin{document}

\setlength{\abovedisplayskip}{-\baselineskip}

\begin{equation}
    \textbf{Calculation}\qquad ROIC \ Ticker = \frac{e^{(\sum_{i=1}^{n}{\ln{(1+Daily \ Ticker \ Contribution)}}}-1}{\frac{\sum_{i=1}^{n}|Position \ Size \ (CPS)|}{n}}
\end{equation}

\end{document}