Extending Morris Method: identification of the interaction graph using cycle-equitabe designs

Abstract : The paper presents designs that allow detection of mixed effects when performing preliminary screening of the inputs of a scalar function of $d$ input factors, in the spirit of Morris' Elementary Effects approach. We introduce the class of $(d,c)$-cycle equitable designs as those that enable computation of exactly $c$ second order effects on all possible pairs of input factors. Using these designs, we propose a fast Mixed Effects screening method, that enables efficient identification of the interaction graph of the input variables. Design definition is formally supported on the establishment of an isometry between sub-graphs of the unit cube $Q_d$ equipped of the Manhattan metric, and a set of polynomials in $(X_1,\ldots, X_d)$ on which a convenient inner product is defined. In the paper we present systems of equations that recursively define these $(d,c)$-cycle equitable designs for generic values of $c\geq 1$, from which direct algorithmic implementations are derived. Application cases are presented, illustrating the application of the proposed designs to the estimation of the interaction graph of specific functions.
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Jean-Marc Fédou, Maria João Torres Dolores Rendas. Extending Morris Method: identification of the interaction graph using cycle-equitabe designs. Journal of Statistical Computation and Simulation, Taylor & Francis, 2015, 85 (7), pp. 1281-1282. ⟨http://www.tandfonline.com/⟩. ⟨10.1080/00949655.2015.1008226⟩. ⟨hal-01318096⟩

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