graphviz - SEM 残差协方差

graphviz - SEM residual covariance

我无法找到如何使用 graphviz 在两个矩形之间绘制曲线,例如

digraph G {

SatisfactionF [style=filled, shape = rectangle] 
SatisfactionM [style=filled, shape = rectangle]  
Marital[shape = circle] 

       SatisfactionF -> Marital
       SatisfactionM -> Marital
}

给你:

digraph G {

{
rank = same;
SatisfactionF [style=filled, shape = rectangle] 
SatisfactionM [style=filled, shape = rectangle]  
}
Marital[shape = circle] 

       SatisfactionF -> Marital
       SatisfactionM -> Marital


SatisfactionF -> SatisfactionM [label = "0.4" tailport=n headport=n dir=both arrowhead=none]

}

它会发出警告,但它有效。