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iii). Understanding .csv files
The first 100 rows of the .csv file contains all the information about the device, its firmware and the
trial information included upon device configuration. In both the raw data and the epoch compressed
files, the data starts from line 101 and is organised in the following columns.
Column
A
B
C
D
E
F
G
H
I
J
K
L
In the epoch compressed .csv, the gravity-subtracted sum of vector magnitudes is calculated as
follows:
SVM
s = ∑ | (x
g
For each measurement in the epoch the vector magnitude is created and 1g is subtracted. When
the accelerometer is static and the earth's gravitation pull is the only acceleration, the result of this
will be close to zero.
The total number of measurements in the sum is defined by multiplying the recording frequency by
the epoch length. Measurements from different recording frequencies and epoch lengths can be
compared with suitable scaling.
16
Raw Data
Time stamp
X axis (g)
Y axis (g)
Z axis (g)
Light level (lux)
Button (1/0)
Temperature (◦C)
-
-
-
-
-
+y
+z
)
- 1g |
2
2
2
½
Epoch Compressed
Time stamp of epoch end
Mean x axis
Mean y axis
Mean z axis
Mean lux
Sum of button press time
Mean temperature
Sum of vector
X axis standard deviation
Y axis standard deviation
Z axis standard deviation
Peak lux