High Quality Content by WIKIPEDIA articles! The Chebyshev center of a bounded set Q having non-empty interior is the center of the minimal radius ball enclosing the entire set Q.Estimation theory is a branch of statistics and signal processing that deals with estimating the values of parameters based on measured/empirical data. The parameters describe an underlying physical setting in such a way that the value of the parameters affects the distribution of the measured data. An estimator attempts to approximate the unknown parameters using the measurements.