Writing equation with new line in Quarto

[JauntyJJS]

Hello,

I wanted to write a latex equation that gives this expected results

Unfortunately, when I try to render the document

---
title: "testing"
format: html
---

$$
\mathrm F_{test} = \frac{(\mathrm n-2) \ \mathrm S_{y/x,lin}^2 \ - \ (\mathrm n-3) \ \mathrm S_{y/x,non}^2}{\mathrm S_{y/x,non}^2}

\\

\text{where} \ \mathrm S \ \text{is the standard error of the regression,} \ lin \ \text{for the straight line model and} \ non \ \text{for the quadratic model.}
$$

It gives the following

Any idea how to create a new line after the equation ?

[njbart]

From the pandoc manual: “[…] there can be no blank lines between the opening and closing $$ delimiters.”

[JauntyJJS]

I see. I guess one workaround is as follows:

---
title: "testing"
format: html
---

$$ \mathrm F_{test} = \frac{(\mathrm n-2) \ \mathrm S_{y/x,lin}^2 \ - \ (\mathrm n-3) \ \mathrm S_{y/x,non}^2}{\mathrm S_{y/x,non}^2}
$$
where $\mathrm S$ is the standard error of the regression, $lin$ for the straight line model and $non$ for the quadratic model.

[njbart]

Well, that is also an option, although the actual problem in the OP lies in the empty lines in the source code.

[JauntyJJS]

Hmm...

I have tried the following this time

---
title: "testing"
format: html
---

$$
\begin{aligned}
\mathrm F_{test} = \frac{(\mathrm n-2) \ \mathrm S_{y/x,lin}^2 \ - \ (\mathrm n-3) \ \mathrm S_{y/x,non}^2}{\mathrm S_{y/x,non}^2}
\\
\\
\text{where}
\\
\mathrm S \ \text{is the standard error of the regression} 
\\
lin \ \text{for the straight line model}
\\ 
non \ \text{for the quadratic model.}
\end{aligned}
$$

it seems close to what I need

Is there a way to make the text left align instead of right ?

[njbart]

You could insert alignment characters (&), or use a \parbox.

$$
\begin{aligned}
& \mathrm F_{test} = \frac{(\mathrm n-2) \ \mathrm S_{y/x,lin}^2 \ - \ (\mathrm n-3) \ \mathrm S_{y/x,non}^2}{\mathrm S_{y/x,non}^2}
\\
& \text{where} \\
& \mathrm S \ \text{is the standard error of the regression} \\
& lin \ \text{for the straight line model} \\
& non \ \text{for the quadratic model.}
\end{aligned}
$$

$$
\begin{aligned}
\mathrm F_{test} = \frac{(\mathrm n-2) \ \mathrm S_{y/x,lin}^2 \ - \ (\mathrm n-3) \ \mathrm S_{y/x,non}^2}{\mathrm S_{y/x,non}^2}
\\
\parbox{72mm}{where $\mathrm S$ is the standard error of the regression, $lin$ for the straight line model, 
$non$ for the quadratic model.}
\end{aligned}
$$

[JauntyJJS]

Thank you for the assistance.