In 2006, Paul W. Holland retired from Educational Testing Service (ETS) after a career
spanning five decades. In 2008, ETS sponsored a conference, Looking Back, honoring …

​ In order to precisely model real-life systems or man-made devices, both nonlinear and
dynamic properties need to be taken into account. The generic, black-box model based on …

The problem of discrete Fourier analysis of observations at nonequidistant times using the
standard set of complex harmonics exp (i2πkt), t∈ R, k= 0,±1,±2,..., and the least squares …

Four nonparametric Haarregression estimates are proposed and applied to the system
nonlinearity identification (recovery). The algorithms are various implementations of the local …

Effective (that is, fast and involving only elementary arithmetic and comparison operations)
computational counterparts of the identification algorithms are proposed. The …

The fundamental relation between the Hammerstein system nonlinearity and the regression
function of the system output on the system input is presented. It allows recovery of the …

Two Haarwavelet bases, classic and the recently introduced unbalanced one, are presented
together with the corresponding fast wavelet transforms (in the classic and lifting versions) …

A discrete-time cascade of a static nonlinearity followed by a linear dynamics, ie the
Hammerstein system, is presented. Its equivalence (from the proposed identification …