ECG Signal Analysis - ECG Acquisition and Automated Remote Processing - page 39

Fig. 2.15 Fiducial point determination from ptb-db data. a Normal data. b Abnormal data—MI-

inferior

Variation among the different wave durations and intervals is computed and
expressed as coefficient of variation (COV) figure, given as
C v ¼ r
l

where r is the standard deviation and l is the mean value of the parameter.
Table 2.7 shows some of the coefficients of variation figures of the time-plane
signatures out of total 240 single-lead ptb-db data.