Papers › Structural Equation Models as Computation Graphs
Structural Equation Models as Computation Graphs
Erik-Jan van Kesteren, Daniel L. Oberski
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Structural equation modeling (SEM) is a popular tool in the social and behavioural sciences, where it is being applied to ever more complex data types. The high-dimensional data produced by modern sensors, brain images, or (epi)genetic measurements require variable selection using parameter penalization; experimental models combining disparate data sources benefit from regularization to obtain a stable result; and genomic SEM or network models lead to alternative objective functions. With each proposed extension, researchers currently have to completely reformulate SEM and its optimization algorithm -- a challenging and time-consuming task. In this paper, we consider each SEM as a computation graph, a flexible method of specifying objective functions borrowed from the field of deep learning. When combined with state-of-the-art optimizers, our computation graph approach can extend SEM without the need for bespoke software development. We show that both existing and novel SEM improvements follow naturally from our approach. To demonstrate, we discuss least absolute deviation estimation and penalized regression models. We also introduce spike-and-slab SEM, which may perform better when shrinkage of large factor loadings is not desired. By applying computation graphs to SEM, we hope to greatly accelerate the process of developing SEM techniques, paving the way for new applications. We provide an accompanying R package tensorsem.
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