AccelerationFeatures class

A set of acceleration (non-gravitational) features collected over a specific sampling period.

The set of features is inspired from the Medium article on Feature Engineering on Time-Series Data for Human Activity Recognition and contains the following 15 simple statistical features:

1. mean
2. standard deviation
3. average absolute deviation
4. minimum value
5. maximum value
6. difference of maximum and minimum values
7. median
8. median absolute deviation
9. inter-quartile range
10. negative values count
11. positive values count
12. number of values above mean
13. energy
14. average resultant acceleration
15. signal magnitude area

Most of these features are self-explanatory, except:

• Energy of a signal in every axis is computed by taking the mean of sum of squares of the values in a window in that particular axis.
• Average resultant acceleration over the window is computed by taking average of the square roots of the values in each of the three axis squared and added together.
• Signal magnitude area is defined as the sum of absolute values of the three axis averaged over a window.

Inheritance

• Object
• Serializable
• Data
• SensorData
• AccelerationFeatures

Annotations

• @JsonSerializable(fieldRename: FieldRename.none, includeIfNull: false)

Constructors

AccelerationFeatures()

AccelerationFeatures.fromAccelerometerReadings(List<UserAccelerometerEvent> readings)

factory

AccelerationFeatures.fromJson(Map<String, dynamic> json)

factory

Properties

$type ↔ String?

The runtime class name (type) of this object. Used for deserialization from JSON objects.

getter/setter pair, inherited

avgResultAcceleration ↔ num?

getter/setter pair

count ↔ int

getter/setter pair

format → DataType

The format of this data as a DataType.

no setter, inherited

fromJsonFunction → Function

The function which can convert a JSON string to an object of this type.

no setter, override

hashCode → int

The hash code for this object.

no setter, inherited

jsonType → String

Return the __type to be used for JSON serialization of this class. Default is runtimeType. Only specify this if you need another type.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

sensorSpecificData ↔ Data?

Additional sensor-specific data pertaining to this data point. This can be used to append highly-specific sensor data to an otherwise common data type.

getter/setter pair, inherited

signalMagnitudeArea ↔ num?

getter/setter pair

xAad ↔ num?

getter/setter pair

xAboveMean ↔ num?

getter/setter pair

xEnergy ↔ num?

getter/setter pair

xIqr ↔ num?

getter/setter pair

xMad ↔ num?

getter/setter pair

xMax ↔ num?

getter/setter pair

xMaxMinDiff ↔ num?

getter/setter pair

xMean ↔ num?

getter/setter pair

xMedian ↔ num?

getter/setter pair

xMin ↔ num?

getter/setter pair

xNegCount ↔ num?

getter/setter pair

xPosCount ↔ num?

getter/setter pair

xStd ↔ num?

getter/setter pair

yAad ↔ num?

getter/setter pair

yAboveMean ↔ num?

getter/setter pair

yEnergy ↔ num?

getter/setter pair

yIqr ↔ num?

getter/setter pair

yMad ↔ num?

getter/setter pair

yMax ↔ num?

getter/setter pair

yMaxMinDiff ↔ num?

getter/setter pair

yMean ↔ num?

getter/setter pair

yMedian ↔ num?

getter/setter pair

yMin ↔ num?

getter/setter pair

yNegCount ↔ num?

getter/setter pair

yPosCount ↔ num?

getter/setter pair

yStd ↔ num?

getter/setter pair

zAad ↔ num?

getter/setter pair

zAboveMean ↔ num?

getter/setter pair

zEnergy ↔ num?

getter/setter pair

zIqr ↔ num?

getter/setter pair

zMad ↔ num?

getter/setter pair

zMax ↔ num?

getter/setter pair

zMaxMinDiff ↔ num?

getter/setter pair

zMean ↔ num?

getter/setter pair

zMedian ↔ num?

getter/setter pair

zMin ↔ num?

getter/setter pair

zNegCount ↔ num?

getter/setter pair

zPosCount ↔ num?

getter/setter pair

zStd ↔ num?

getter/setter pair

Methods

equivalentTo(Data other) → bool

Is this data equivalent to other?

inherited

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toJson() → Map<String, dynamic>

Return a JSON encoding of this object.

override

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Constants

dataType → const String