Trial wavefunctions correlated sampling

A correlated sampling method, known as reweighting [39,40] is much more efficient. One samples a set of configurations Rj (usually several thousand points at least) according to some distribution function, usually taken to be the square of the wavefunction for some initial trial function ] f T(-R q o) -Then, the variational energy (or the variance) for trial function nearby in parameter space can be calculated by using the same set of points ... 

Although the direct application of correlated sampling can be inefficient in a high-dimensional parameter space, it can be fruitfully combined with a standard minimization technique such as the steepest-descent method [24]. Consider again the trial wavefunction c) containing a parametric... 

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