\documentclass{article}
\usepackage{amsmath}
\usepackage{lipsum}
\begin{document}
\begin{align}
SSE = \sum_{i=1}^n(y_i-\hat{y_i})\notag\\
SST = \sum_{i=1}^n(y_i-\bar{y})\notag\\
\end{align}
\end{document}
我没看出来的你的图示是按什么对齐的,你的图示看上去很丑......
可能的正确示例如下:
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{align*}
SSE &= \sum_{i=1}^n(y_i-\hat{y_i})\\
SST &= \sum_{i=1}^n(y_i-\bar{y})
\end{align*}
\end{document}
在公式环境不可以空行!!!你的MWE并不work...
\documentclass{article}
\usepackage{amsmath}
\usepackage{lipsum}
\begin{document}
\begin{align}
SSE = \sum_{i=1}^n(y_i-\hat{y_i})\notag\\
SST = \sum_{i=1}^n(y_i-\bar{y})\notag\\
\end{align}
\end{document}
倒数第三行!!!不允许空行!!!
这将会报错:
SSE = \sum _{i=1}^n(y_i-\hat {y_i})\notag \\ SST = \sum _{i=1}^n(y_i\ETC.
! Paragraph ended before \align was complete.
<to be read again>
\par
l.9