[Feature] Respiratory Amplitude Variability (RAV)

[DominiqueMakowski]

#853

I'm not aware of much literature on that, but it doesn't seem absurd as a potential feature of interest

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.16% ⚠️

Comparison is base (a802b57) 55.23% compared to head (6834e14) 55.08%.
Report is 50 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #873      +/-   ##
==========================================
- Coverage   55.23%   55.08%   -0.16%     
==========================================
  Files         297      300       +3     
  Lines       13917    14008      +91     
==========================================
+ Hits         7687     7716      +29     
- Misses       6230     6292      +62     

Files Changed	Coverage Δ
neurokit2/rsp/__init__.py	100.00% <100.00%> (ø)
neurokit2/rsp/rsp_intervalrelated.py	94.73% <100.00%> (+1.63%)	⬆️
neurokit2/rsp/rsp_rav.py	100.00% <100.00%> (ø)

... and 11 files with indirect coverage changes

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[danibene]

@DominiqueMakowski just had a quick look so far - do you think you could add some tests?