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paulvangentcom / heartrate_analysis_python

Python Heart Rate Analysis Package, for both PPG and ECG signals
MIT License
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What "s" stand for? #89

Closed BaggioMarco closed 2 years ago

BaggioMarco commented 2 years ago

Hi,

thank you so much for this great pack! I'm just wondering which is the meaning of "s" that is listed among the other indices. It get printed by this block below:

#display measures computed
for measure in m.keys():
    print('%s: %f' %(measure, m[measure]))

thanks in advance

paulvangentcom commented 2 years ago

It's a component of the poincare analysis.

Consider this snippet of code:

import heartpy as hp

data, _ = hp.load_exampledata(2)
wd, m = hp.process(data, sample_rate = 100.0, high_precision = True)
hp.plot_poincare(wd, m)

This gives the following plot: poincareplot

This plots the peak-peak intervals with RR(n) on the x-axis and RR(n+1) on the Y axis.

SD1 is the standard deviation of intervals along the identity line (x=y) SD2 is the standard deviation of intervals perpendicular to the identity line S is the surface area of the ellipsoid described by SD1 and SD2

Hope this answers your question :)

Cheers

paulvangentcom commented 2 years ago

Closing for now. Feel free to re-open if you have additional questions or comments