Patent ID: 8271219

Claim:
A deterministic component model identifying apparatus for determining a type of a deterministic component contained in a probability density function supplied thereto, comprising: one or more processors that cause the deterministic component model identifying apparatus to perform operations comprising: calculating a spectrum of the probability density function on an axis of a predetermined variable; detecting a first null value on the axis of the predetermined variable in the calculated spectrum; calculating theoretical values of a spectrum of the deterministic component based on the detected first null value, each of the theoretical values corresponding to one of a plurality of predetermined deterministic component types; and determining the type of the deterministic component contained in the probability density function based on a plurality of logarithmic magnitude spectrum differences, each of the logarithmic magnitude spectrum differences being produced by subtracting one of the theoretical values calculated in association with the plurality of predetermined deterministic component types from the calculated spectrum, the determining including: calculating, in association with each of the plurality of predetermined deterministic component types, a logarithmic magnitude spectrum difference by subtracting the theoretical value of the spectrum of the deterministic component from the calculated spectrum; approximating, in association with each of the plurality of predetermined deterministic component types, the logarithmic magnitude spectrum difference by a quadratic curve and calculating, in association with each of the plurality of predetermined deterministic component types, a residual error by removing a component of the quadratic curve from the logarithmic magnitude spectrum difference; and selecting, as the type of the deterministic component contained in the probability density function, a deterministic component type associated with a smallest residual error from among the calculated residual errors.