Some observations on state space grids and closely related nonlinear methods.
State space grids are the most frequently used form of nonlinear analysis in this  special issue. This article elaborates on hypotheses one can test using them, the role of  entropy constructs, and expansions to experimental designs and analysis that one can reasonably  make to study system stability questions or systems with three or more interacting agents.
Marquette University, Milwaukee, WI, USA. stephen.quastello@marquette.edu
Stephen J
SJ
Guastello
D006801:Humans; D001523:Mental Disorders / Q000523:psychology*; D017711:Nonlinear Dynamics; D012107:Research Design