The Wiggins Group is familiar with all standard statistical methodologies, and can assist with analyses using SPSS, SAS, Mathematica, and GAMS, among others. Our specialty is advanced statistical analysis, including the iterative
Kolmogorov-Smirnov (IKS) method, Data Envelopment Analysis (DEA), event history (survival) analysis, and structural equation modelling (LISREL).
The iterative Kolmogorov-Smirnov (IKS) method, developed by Dr. Timothy W. Ruefli of the University of Texas at Austin and Dr. Robert R. Wiggins of The University of Memphis, is a non-parametric polythetic divisive clustering technique which
stratifies a longitudinal time-series sample along one dimension. To see an example of its application, download the Adobe Acrobat PDF version of Sustained Competitive Advantage: Temporal Dynamics and the Rarity of Persistent Superior Economic Performance.