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@@ -1,2 +1,32 @@
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-# head-motion-ema
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+# Ecological Momentary Assessment of Head Motion
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+Data collected from 10 subjects with Actigraph GT9X Link IMUs attached to waist and head.
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+* Sensors: accelerometer and gyroscope
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+* Sampling rate: 100 Hz
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+* Axes:
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+ * *x*: anterior/posterior (positive forward)
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+ * *y*: medial/lateral (positive left)
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+ * *z*: vertical (positive upward, perpendicular to Reid's plane for the head sensor)
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+
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+Data is stored in the [netCDF](https://www.unidata.ucar.edu/software/netcdf/) format with the following specification:
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+
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+*Dimensions:*
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+ axis: ('x', 'y', 'z')
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+ sample: datetime64[ns]
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+
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+*Coordinates:*
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+ gender string (M/F)
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+ age int64
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+ weight int64
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+ height int64
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+ subject_id string (001-010)
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+
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+*Data variables:*
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+ AccHead (sample, axis) float64
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+ GyrHead (sample, axis) float64
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+ AccWaist (sample, axis) float64
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+ GyrWaist (sample, axis) float64
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+
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+Accelerometer measurements of head (`AccHead`) and waist (`AccWaist`) are stored in g (1g = 9.81m/s). Gyroscope measurements of head (`GyrHead`) and waist (`GyrWaist`) are stored in rad/s. Excluded periods for either sensor location are stored as `nan`.
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+
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+Files are stored in `data/XXX.nc` where `XXX` is the subject identifier (`001`-`010`). Demographic information is additionally available in `data/subject_info.csv`.
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