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. 2015 Feb 13;373(2034):20140098. doi: 10.1098/rsta.2014.0098

Figure 1.

Figure 1.

Basic principle of transformation in HRJSD. Top: transformation of the bivariate sample vector X (BBI,beat-to-beat intervals (ms); RESP,respiratory frequency (s)) into the bivariate symbol vector S (0, decreasing values; 1, equal values; 2, increasing values). Middle: Word distribution density matrix Wn (27× 27). Bottom: Word pattern family distribution density matrix Wf (8×8) with eight pattern families wf, rfBBI row sum of specific word family and cfRESP column sum of specific word family.