1. A diagnostic method comprising: receiving a first digitized human voice sample, associated with a target person, into an associated data storage; determining a first curve representation of the first digitized sample in accordance with an associated wave domain; applying a curve fitting to the first curve representation in accordance with a plurality of parameter weights; storing data representative of the first curve fitting; receiving a second digitized human voice sample from the target person; determining a second curve representation of the second digitized sample in accordance with an associated wave domain; applying a curve fitting to the second curve representation in accordance with the plurality of parameter weights; storing data representative of a second curve fitting; calculating a difference value between the first curve fitting and the second curve fitting; and determining a vocal disorder in accordance with a calculated difference value.