标记决策树中的连接

Question

我正在使用该包自定义一个现成的脚本来构建决策树TikZ，但无法以任何方式标记节点之间的连接？是否有用于标记决策树中连接的工具？此外，如何确保我的标签始终位于连接上方？我已包含代码和输出。我在输出上绘制了连接标签以显示我想要实现的目标。

\documentclass{article}
\usepackage{pgf, tikz}
\begin{document}

\begin{tikzpicture}[sibling distance=15em,
every node/.style = {shape=rectangle, rounded corners,
    draw, align=center,
    top color=white, bottom color=gray!20}]]
\node {no slopes}
child { node {subj slope} 
    child { node {subj \& item slopes} 
        child { node {\textbf{max RE}} }
        child { node {\textbf{subj slope}} }}
    child { node {item slope} 
        child { node {subj \& item slopes} 
            child { node {\textbf{max RE}} } 
            child { node {\textbf{item slope}} } } 
        child { node {\textbf{no slopes}} } }};
    \end{tikzpicture}

\end{document}

Answer 1

可以使用键添加连接forest标签edge label

\documentclass{article}
\usepackage{amssymb}
\usepackage{forest}
\begin{document}
\begin{forest}
for tree={l sep+=.8cm,s sep+=.5cm,shape=rectangle, rounded corners,
    draw, align=center,
    top color=white, bottom color=gray!20}
[no slopes
  [subject slope
     [subj \& item slopes,for children={font=\bfseries},edge label={node[midway,left]{$\checkmark$}} 
       [max RE]
       [subj slope]     
     ]
     [max RE,font=\bfseries,edge label={node[midway,right]{$\times$}}  
       [subj \& item slopes,for children={font=\bfseries}
         [max RE]
         [item slope]       
       ]
       [no slopes]
     ]
   ]  
]    
\end{forest}
\end{document}