Disease Classification and Biomarker Discovery Using ECG Data

Table 3

Major quantile features in the first eight principal components.

Principal components	Major quantile features	Contribution (63.60%)
PC1	QT-int_p95, Down-T-slo_p95, QT-int_p90, Down-T-slo_p90, Down-T-slo_p75	22.62%
PC2	Down-T-slo_p25, Down-T-slo_p5, Down-T-slo_p10, Down-T-slo_p75, Down-T-slo_p90	10.8%
PC3	Up-R-slo_p99, QRS-amp_p99, Up-T-slo_p99, T-amp_p99, Up-T-slo_p95	9.36%
PC4	Up-P-slo_p1, P-amp_p75, PR-slo_p75, P-amp_p90, Down-R-slo_p95	7.12%
PC5	TP-slo_p10, TP-slo_p5, TP-slo_p25, RR-int_p90, RR-int_p95	5.84%
PC6	PR-int_p75, PR-int_p90, PR-int_p95, PR-int_p99, PR-int_p25	4.53%
PC7	Up-R-slo_p25, Up-R-slo_p1, P-int_p25, Down-R-slo_p25, T-amp_p99	3.32%
PC8	Up-R-slo_p1, Down-P-slo_p90, Down-P-slo_p75, Up-R-slo_p5, Down-P-slo_p95	3.00%

Note: “-int” represents the length of the indicated interval, “-slo” represents the slope of the indicated waveform, and “-amp” represents the amplitude of the indicated wave.