[Tex/LaTex] Horizontal Probability Tree with Level Labels

tikz-pgftikz-treestrees

I'm trying to create a Horizontal Probability Tree with Level Labels using tikz. (Not tikz-qtree). Right now, I have a horizontal tree. The labels are NOT aligned to the top of the diagram. I would like to have all the labels aligned without having to manually tweak positions.

Here is the MWE:

\tikzstyle{level 1}=[level distance=3.5cm, sibling distance=3.5cm]
\tikzstyle{level 2}=[level distance=4.5cm, sibling distance=1.5cm]
\tikzstyle{level 3}=[level distance=3.5cm, sibling distance=2cm]


\tikzstyle{bag} = [text width=4em, text centered]
\tikzstyle{end} = [rectangle, draw=none, minimum width=3pt, inner sep=0pt]

\tikzstyle{ans} = [color=red]


\begin{tikzpicture}[level distance=5cm,
level 1/.style={sibling distance=3.5cm},
level 2/.style={sibling distance=1.2cm},
level 3/.style={level distance = 2cm},grow'=right]
\tikzstyle{every node}=[]
    \node (Root) [] {Origin}
        child [] {
        node {Door A}
        child { node {A} 
                child {node[end] {$0$} }
                edge from parent
                node[left] {$0$}
        }
        child [black] { node {B} 
                child {node[ans,end] {$\frac{1}{6}$} }
                edge from parent
                node[ans,left] {$\frac{1}{2}$}
        }
        child [black] { node {C} 
                child {node[ans,end] {$\frac{1}{6}$} }
            edge from parent
            node[ans,left] {$\frac{1}{2}$}
        }
        edge from parent
        node[above] {$\frac{1}{3}$}
    }
    child {
        node {Door B}
        child { node {A} 
                child {node[ans,end] {$0$} }
                edge from parent
                node[ans,left] {$0$}
        }
        child { node {B} 
                child {node[end] {$0$} }
                edge from parent
                node[ans,left] {$0$}
        }
        child { node {C} 
                child {node[ans,end] {$\frac{1}{3}$} }
                edge from parent
                node[ans,left] {$1$}
        }
        edge from parent
        node[ans,left] {$\frac{1}{3}$}
    }
    child {
        node {Door C}
        child { node {A} 
                child {node[ans,end] {$0$} }
                edge from parent
                node[ans,left] {$0$}
        }
        child { node {B}
                child {node[ans,end] {$\frac{1}{3}$} }
                edge from parent
                node[ans,left] {$1$}
        }
        child { node {C}
                child {node[end] {$0$} }
                edge from parent
                node[ans,left] {$0$}
        }
        edge from parent
        node[ans,left] {$\frac{1}{3}$}
    };
   % How I'm applying labels to each level. 
  % Need to be able to dynamically align nodes at top level
\begin{scope}[every node/.style={above}]
 \path (Root    -| Root)  ++(0,15mm) node {Test};
 \path (Root-1   -| Root-1)  ++(0,15mm) node {Contestant Chooses};
 \path (Root-1-1  -| Root-3-3-1)  ++(10mm,13mm) node {Host Reveals Door};
 \path (Root-1-1-1 -| Root-3-3) ++(0,15mm) node {Probability};
\end{scope}


\end{tikzpicture}

I get this

enter image description here

and want this
enter image description here

Best Answer

You can use intersections coordinate system to align all level labels. First place the label for the top most leaf where you want:

\node[above= 1cm of Root-1-1-1] (labels-level) {Host Reveals Door};

and later, use it as an horizontal reference for all other labels

\node[at =(labels-level-|Root-1-1)] {Probability};
\node[at =(labels-level-|Root-1)] {Contestant Chooses};
\node[at =(labels-level-|Root)] {Test};

I've used positioning library to fix first label position. The complete code is

\documentclass[tikz,border=2mm]{standalone}
\usetikzlibrary{positioning}

\begin{document}

\tikzstyle{level 1}=[level distance=3.5cm, sibling distance=3.5cm]
\tikzstyle{level 2}=[level distance=4.5cm, sibling distance=1.5cm]
\tikzstyle{level 3}=[level distance=3.5cm, sibling distance=2cm]


\tikzstyle{bag} = [text width=4em, text centered]
\tikzstyle{end} = [rectangle, draw=none, minimum width=3pt, inner sep=0pt]

\tikzstyle{ans} = [color=red]


\begin{tikzpicture}[level distance=5cm,
level 1/.style={sibling distance=3.5cm},
level 2/.style={sibling distance=1.2cm},
level 3/.style={level distance = 2cm},grow'=right]
\tikzstyle{every node}=[]
    \node (Root) [] {Origin}
        child [] {
        node {Door A}
        child { node {A} 
                child {node[end] {$0$} }
                edge from parent
                node[left] {$0$}
        }
        child [black] { node {B} 
                child {node[ans,end] {$\frac{1}{6}$} }
                edge from parent
                node[ans,left] {$\frac{1}{2}$}
        }
        child [black] { node {C} 
                child {node[ans,end] {$\frac{1}{6}$} }
            edge from parent
            node[ans,left] {$\frac{1}{2}$}
        }
        edge from parent
        node[above] {$\frac{1}{3}$}
    }
    child {
        node {Door B}
        child { node {A} 
                child {node[ans,end] {$0$} }
                edge from parent
                node[ans,left] {$0$}
        }
        child { node {B} 
                child {node[end] {$0$} }
                edge from parent
                node[ans,left] {$0$}
        }
        child { node {C} 
                child {node[ans,end] {$\frac{1}{3}$} }
                edge from parent
                node[ans,left] {$1$}
        }
        edge from parent
        node[ans,left] {$\frac{1}{3}$}
    }
    child {
        node {Door C}
        child { node {A} 
                child {node[ans,end] {$0$} }
                edge from parent
                node[ans,left] {$0$}
        }
        child { node {B}
                child {node[ans,end] {$\frac{1}{3}$} }
                edge from parent
                node[ans,left] {$1$}
        }
        child { node {C}
                child {node[end] {$0$} }
                edge from parent
                node[ans,left] {$0$}
        }
        edge from parent
        node[ans,left] {$\frac{1}{3}$}
    };
   % How I'm applying labels to each level. 
  % Need to be able to dynamically align nodes at top level
\begin{scope}[every node/.style={text width=2cm, align=center, anchor=center, font=\bfseries,}]
 \node[above= 1cm of Root-1-1-1] (labels-level) {Host Reveals Door};
 \node[at =(labels-level-|Root-1-1)] {Probability};
 \node[at =(labels-level-|Root-1)] {Contestant Chooses};
 \node[at =(labels-level-|Root)] {Test};

\end{scope}
\end{tikzpicture}
\end{document}

and the result (change labels aspect as you want)

enter image description here

Related Solutions

[Tex/LaTex] How to define the default vertical distance between nodes

I don't really get the question so I hope this is what you wanted. If you include a full document (such that we copy paste and see the problem on our systems) things are much more easier.

Here, you can change the default setting within a scope but your block style had a node distance which was resetting every time it is issued. I've made it 2mm such that we can see the difference easier.

\documentclass[tikz]{standalone}
\usetikzlibrary{arrows,shapes.geometric,positioning}

\begin{document}
\begin{tikzpicture}[decision/.style={diamond, draw, text width=4.5em, text badly centered, node distance=3.5cm, inner sep=0pt},
                    block/.style   ={rectangle, draw, text width=6em, text centered, rounded corners, minimum height=4em, minimum height=2em},
                    cloud/.style   ={draw, ellipse, minimum height=2em},
                    line/.style    ={draw,-latex'},
                    node distance = 1cm, 
                    auto]
    \node [block] (1st) {1st};
    \node [block, right= of 1st]  (2nd1) {2nd1};
\begin{scope}[node distance=2mm and 10mm]%Here we change it for everything inside this scope
    \node [block, above= of 2nd1] (2nd2) {2nd2};
    \node [block, below= of 2nd1] (2nd3) {2nd3};
    \node [block, right= of 2nd1] (3rd1) {3rd1};
    \node [block, above= of 3rd1] (3rd2) {3rd2};
    \node [block, above= of 3rd2] (3rd3) {3rd3};
\end{scope}
    \node [block, below= of 3rd1] (3rd4) {3rd4};
    \node [block, below= of 3rd4] (3rd5) {3rd5};

    \path [line] (1st) -- (2nd1);
    \path [line] (2nd1) -- (2nd2);
    \path [line] (2nd1) -- (2nd3);
    \path [line] (2nd2) -- (3rd3);
    \path [line] (2nd1) -- (3rd1);
    \path [line] (1st) -- (2nd1);
\end{tikzpicture}
\end{document}

enter image description here

[Tex/LaTex] Mindmap level specific child distance

You can use level distance=<length> and/or sibling angle=<value> inside level <number>/.append style to customize the distance and angle for an specific level. A complete example:

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{mindmap,trees}

\begin{document}
\resizebox{!}{4 in}{%
   \begin{tikzpicture}
      \path[
         mindmap,
         concept color=black,
         text=white,
         grow cyclic,
         segment length=20cm,
level 1/.append style={level distance=8cm,sibling angle=60},
level 2/.append style={level distance=2.5cm},
      ]
      node[concept] {Main}
      [clockwise from=0]
      child[concept color=green!50!black] {%
         node[concept] {A}
         [clockwise from=30]
         child {node[concept] {A1} }
         child {node[concept] {A2} }
         child {node[concept] {A3} }
         child {node[concept] {A4} }
         child {node[concept] {A5} }
         child {node[concept] {A6} }
      }  
      child[concept color=blue] {%
         node[concept] {B}
         [clockwise from=30]
         child {node[concept] {B1} }
         child {node[concept] {B2} }
         child {node[concept] {B3} }
         child {node[concept] {B4} }
         child {node[concept] {B5} }
         child {node[concept] {B6} }
      }
      child[concept color=red] {%
         node[concept] {C}
         [clockwise from=30]
         child {node[concept] {C1} }
         child {node[concept] {C2} }
         child {node[concept] {C3} }
         child {node[concept] {C4} }
         child {node[concept] {C5} }
         child {node[concept] {C6} }
      }
      child[concept color=orange] {%
         node[concept] {D}
         [clockwise from=30]
         child {node[concept] {D1} }
         child {node[concept] {D2} }
         child {node[concept] {D3} }
         child {node[concept] {D4} }
         child {node[concept] {D5} }
         child {node[concept] {D6} }
      }
      child[concept color=magenta] {%
         node[concept] {E}
         [clockwise from=30]
         child {node[concept] {E1} }
         child {node[concept] {E2} }
         child {node[concept] {E3} }
         child {node[concept] {E4} }
         child {node[concept] {E5} }
         child {node[concept] {E6} }
      }
      child[concept color=brown] {%
         node[concept] {F}
         [clockwise from=30]
         child {node[concept] {F1} }
         child {node[concept] {F2} }
         child {node[concept] {F3} }
         child {node[concept] {F4} }
         child {node[concept] {F5} }
         child {node[concept] {F6} }
      };
   \end{tikzpicture}
}
\end{document}

enter image description here

Best Answer

Related Solutions

[Tex/LaTex] How to define the default vertical distance between nodes

[Tex/LaTex] Mindmap level specific child distance

Related Question