File:Twin Study Structural ACE model.png

Summary

You can reproduce this in graphviz as follows digraph G { splines="FALSE";

 /*        entities */
 Twin1  [label="Twin1", shape=box]
 Twin2  [label="Twin2", shape=box]

 A1  [label="A"]
 C1  [label="C"]
 E1  [label="E"]

 A2  [label="A"]
 C2  [label="C"]
 E2  [label="E"]

/* relationships */

A1 -> Twin1 [label="37.2"] C1 -> Twin1 [label="1.9 "] E1 -> Twin1 [label="5.0"]

A1 -> A2 [dir=both label="1 / 0.5"] C1 -> C2 [dir=both label="1"]

A2 -> Twin2 [label="37.2"] C2 -> Twin2 [label="1.9"] E2 -> Twin2 [label="5.0"]

/* ranks */
 { rank=max; Twin1; Twin2}; /* max is bottom */
 { rank=min; A1; C1; E1; A2; C2; E2;}; /* max is bottom */

}

/* Danish male data (a representative population of eight independent multinational cohorts reported in Silventoinen et al (2003) Reference: K. Silventoinen, S. Sammalisto, M. Perola, D. I. Boomsma, B. K. Cornes, C. Davis, L. Dunkel, M. De Lange, J. R. Harris, J. V. Hjelmborg, M. Luciano, N. G. Martin, J. Mortensen, L. Nistico, N. L. Pedersen, A. Skytthe, T. D. Spector, M. A. Stazi, G. Willemsen and J. Kaprio. (2003). Heritability of adult body height: a comparative study of twin cohorts in eight countries. Twin Research, 6, 399-408. 10.1375/136905203770326402 */

Licensing

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