[R] Units

Michael Hart mhart at terrigal.net.au
Sat Sep 23 06:56:14 CEST 2000

I used the AR modelling written for R (S) on blood pressure and heart rate
signals.  I used 60 one second samples and a model order of 20.  I used the
"ar" finction in the "ts" package.

Given that blood pressure is measured in mmHg would the spectral density (on
the graph displayed be [mmHg]sq/Hz ?

And the heart rate is measured in Beats Per Minute (bpm) - so would the
displayed spectral density be in (bpm)sq/Hz ?

I'm sorry if this seems a trivial question, however the resultant values
seem inconsistent with published data (although the spectral shape seems

Michael Hart
+61 2 4325 4859

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