线性模型中 y 截距有符号吗？

Question

线性回归中的模型参数包括响应变量的截距（或者换句话说，y 截距）。这有符号吗？

例如，我在数学符号列表中找不到像这个。

Answer 1

% arara: pdflatex

\documentclass{article}
\usepackage{amssymb}

\begin{document}
    For the y-intercept, a lot of people use the letter $b$, but there is no reference on this. You can refer to your intercept easily as $f(0)$ or name the point $\mathrm{P}(0,f(0))$. A last suggestion would be to type $f(x)\big|_{x = 0}$.

    As always, you do have the possibility to define your own symbols and use them in your whole document:
    \begin{tabbing}
        \hspace*{5ex}\= \kill
        $\mathfrak{y}$ \> $y$-intercept \\
        $\mathfrak{x}$ \> $x$-intercept % just examples, I was surprised by the ugly result...
    \end{tabbing}
\end{document}