Methodological Framework for Estimating the Correlation Dimension in HRV Signals

<table>Maximum slope points are marked with crosses over fitted sigmoid curves. Points calculated using gradient descent criteria from two starting points are shown in dots and circles. <svg height="14.925" id="M120" style="vertical-align:-5.76984pt" version="1.1" viewbox="0 0 12.95 14.925" width="12.95" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,7.675)"><path d="M393 379q-9 -16 -28 -29q-15 -10 -23 -2q-19 19 -36 19q-21 0 -52 -38q-57 -72 -82 -126l-40 -197q-23 -3 -75 -18l-7 7q49 196 74 335q7 43 -2 43q-7 0 -30 -14.5t-47 -37.5l-16 23q37 42 82 73t67 31q41 0 15 -113l-11 -50h4q41 71 85 117t77 46q29 0 45 -26
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<g transform="matrix(.012,-0,0,-.012,7.238,11.762)"><path d="M394 607q0 -25 -15.5 -43t-39.5 -18q-19 0 -32 13t-13 35t16 41.5t40 19.5q20 0 32 -13.5t12 -34.5zM360 349l-57 -283q-38 -188 -122 -263q-72 -64 -114 -64q-16 0 -30 10.5t-14 22.5q0 24 21 45q15 13 26 6q30 -20 54 -20q41 0 65 95q37 147 86 415q6 34 6.5 42.5
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</svg> is the point which corresponds to the maximum slope in the lowest embedded dimension. The inset illustrates the correlation dimension estimation of the three sets of points.</table>

Computational and Mathematical Methods in Medicine

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Figure 3

Figure 3: Methodological Framework for Estimating the Correlation Dimension in HRV Signals 