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From Fellrnr.com, Running tips
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=Data Extraction=
The software uses the TCX format for analysis. Many devices provide TCX files by default, but others require conversion.
{| class="wikitable"
! '''Device '''
! '''Extraction'''
** The standard deviation from the arithmetic mean.
** The standard deviation from the known true value.
* For the overall course the data is calculate for each segment and then combined. The mean (trueness) is mean of the means. The standard deviation (precision) is the square root of the average of the squared standard deviations.
=Footpod Analysis=
The footpod data was collected with a no calibration in the watch (factor = 1.0), and then retrospectively calibrated. This allowed me to provide both raw and calibrated data. I tried several calibration methods:
* A weighted average of the three prior runs using weights of 3, 2, 1 for the three prior days.
* The average of the prior day's run.
{| class="wikitable"
! Calibration
! Trueness
