TikZ bayesnet example

case1.tex

\documentclass[tikz, border=14pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{bayesnet}
\begin{document}
\begin{tikzpicture}
    \node[obs] (x) {$X$};
    \node[obs, above right = of x] (z) {$Z$};
    \node[obs, below right = of z] (y) {$Y$};
    \edge{x}{y};
    \edge{z}{y};
    \edge{z}{x};
    \plate {plate1} {(x)(y)(z)} {$i=1,\ldots, n$ };
    
    \node[latent, right = of y] (x2) {$X^\ast$};
    \node[latent, above right = of x2] (z2) {$Z^\ast$};
    \node[latent, below right = of z2] (y2) {$Y^\ast$};
    \edge{x2}{y2};
    \edge{z2}{y2};
    
    \node[latent, left = of x] (phi) {$\phi$};     
    \node[latent, above right = of z] (gamma) {$\gamma$};
    \node[latent, below right = of y] (psi) {$\Psi$};
    \edge{psi}{y,y2};
    \edge{gamma}{z, z2};
    \edge{phi}{x};
\end{tikzpicture}
\end{document}