1. A method for estimating an identity of a candidate person, the method comprising: providing a sequence of measured values of at least one time interval length value, drawn from a set of measured time interval length values, Δt=Δt(p-q), Δt=Δt(q-r), Δt=Δt(r-s), Δt=Δt(s-t) and Δt=Δt(t-p), corresponding to a P wave, a Q wave, an R wave, an S wave and a T wave, respectively, for a sequence of PQRST electrical signal heart complexes for a candidate person; computing at least one measured statistical parameter, drawn from a set of parameters sp2(Δt;meas), comprising normalized mean m n (Δt;meas), normalized standard deviation sd n (Δt;meas), skewness sk(Δt;meas) and kurtosis ku(Δt;meas), for the at least one measured time interval length, Δt=Δt(p-q), Δt=Δt(q-r), Δt=Δt(r-s), Δt=Δt(s-t) and Δt=Δt(t-p), for the sequence of PQRST complexes associated with the candidate person; providing at least one reference statistical parameter, drawn from a set sp2(Δt;ref), of reference parameters comprising normalized mean m n (Δt;ref), normalized standard deviation sd n (Δt;ref), skewness sk(Δt;ref) and kurtosis ku(Δt;ref), for at least one reference time interval length, Δt=Δt(p-q), Δt=Δt(q-r), Δt=Δt(r-s), Δt=Δt(s-t) and Δt=Δt(t-p), for PQRST complexes associated with a known reference person; forming a difference, Δ2(k2), numbered k2=1,. .. , K2 (K2≧1), dependent upon a magnitude of at least one of the differences, m n (Δt;meas)−m n (Δt;ref), sd n (Δt;meas)−sd n (Δt;ref), sk(Δt;meas)−sk(Δt;ref), and ku(Δt;meas)−ku(Δt;ref), of statistical parameters drawn from the sets sp2(Δt;meas) and sp2(Δt;ref), multiplied by a non-negative weight value, w1′, w2′, w3′ and w4′, respectively; when Δ2(k2) lies in a selected range R2(k2) of values, interpreting satisfaction of this condition as indicating that the candidate person is likely to be the reference person; and when Δ2(k2) does not lie in the range R2(k2) of values, interpreting non-satisfaction of this condition as indicating that the candidate person is not likely to be the reference person; displaying or otherwise indicating at least one of (i) the interpretation that the candidate person is likely to be the reference person and (ii) the interpretation that the candidate person is not likely to be the reference person.