The original data was obtained from [http://archive.ics.uci.edu/ml/datasets/Human+Activity+Recognition+Using+Smartphones#] (http://archive.ics.uci.edu/ml/datasets/Human+Activity+Recognition+Using+Smartphones#)
The data has been normalized by dividing by the range, hence, the units are cancelled.
-
subject: A number from 1 to 30 indicating the subject
-
actId: Indicates the activity performed during the measurements
- walking
- walking upstairs
- walking downstairs
- sitting
- standing
- laying
From column 3 and until 68, the columns represent the mean for each subject and each activity of the variable they are refering to. For example column no. 3 timeBodyAccMeanX is actually the mean for each subject and each activity of the mean time in the accelerometer coming from the body in the X-axis. Also, to avoid explaining each column in this way, a specific format was chosen to show what the variable is referring to. There are 7 arguments:
1. domain: It can be either time or frequency. The time domain signals were captued at a constant rate of 50 Hz, they they were filtered to remove noise. The frequency measurements result from applying a Fast Fourier Transform (FFT) to some of these signals.
2. source: The acceleration signla was separated into body and gravity acceleration signals for each of the axis (X, Y and Z)
3. sensor: The features selected for this database come from the accelerometer and gyroscope 3-axial raw signals.
4. jerk: the body linear acceleration and angular velocity were derived in time to obtain Jerk signals
5. magnitude: The magnitude of these three-dimensional signals were calculated using the Euclidean norm
6. statistics: It can be either the mean or the standard deviation of the specific feature.
7. axis: The signals were separated for each of the 3 axix (X, Y and Z). Some of the features don't refer to a specific axis but to the general measure.
-
timeBodyAccMeanX:
- domain: Time
- source: Body
- sensor: Accelerometer
- jerk: No
- magnitude: No
- statistics: Mean
- axis: X
-
timeBodyAccMeanY:
- domain: Time
- source: Body
- sensor: Accelerometer
- jerk: No
- magnitude: No
- statistics: Mean
- axis: Y
-
timeBodyAccMeanZ:
- domain: Time
- source: Body
- sensor: Accelerometer
- jerk: No
- magnitude: No
- statistics: Mean
- axis: Z
-
timeBodyAccStdX:
- domain: Time
- source: Body
- sensor: Accelerometer
- jerk: No
- magnitude: No
- statistics: Standar Deviation
- axis: X
-
timeBodyAccStdY
- domain: Time
- source: Body
- sensor: Accelerometer
- jerk: No
- magnitude: No
- statistics: Standar Deviation
- axis: Y
-
timeBodyAccStdZ
- domain: Time
- source: Body
- sensor: Accelerometer
- jerk: No
- magnitude: No
- statistics: Standar Deviation
- axis: Z
-
timeGravityAccMeanX
- domain: Time
- source: Gravity
- sensor: Accelerometer
- jerk: No
- magnitude: No
- statistics: Mean
- axis: X
-
timeGravityAccMeanY
- domain: Time
- source: Gravity
- sensor: Accelerometer
- jerk: No
- magnitude: No
- statistics: Mean
- axis: Y
-
timeGravityAccMeanZ
- domain: Time
- source: Gravity
- sensor: Accelerometer
- jerk: No
- magnitude: No
- statistics: Mean
- axis: Z
-
timeGravityAccStdX
- domain: Time
- source: Gravity
- sensor: Accelerometer
- jerk: No
- magnitude: No
- statistics: Standard Deviation
- axis: X
-
timeGravityAccStdY
- domain: Time
- source: Gravity
- sensor: Accelerometer
- jerk: No
- magnitude: No
- statistics: Standard Deviation
- axis: Y
-
timeGravityAccStdZ
- domain: Time
- source: Gravity
- sensor: Accelerometer
- jerk: No
- magnitude: No
- statistics: Standard Deviation
- axis: Z
-
timeBodyAccJerkMeanX
- domain: Time
- source: Body
- sensor: Accelerometer
- jerk: Yes
- magnitude: No
- statistics: Mean
- axis: X
-
timeBodyAccJerkMeanY
- domain: Time
- source: Body
- sensor: Accelerometer
- jerk: Yes
- magnitude: No
- statistics: Mean
- axis: Y
-
timeBodyAccJerkMeanZ
- domain: Time
- source: Body
- sensor: Accelerometer
- jerk: Yes
- magnitude: No
- statistics: Mean
- axis: Z
-
timeBodyAccJerkStdX
- domain: Time
- source: Body
- sensor: Accelerometer
- jerk: Yes
- magnitude: No
- statistics: Standard Deviation
- axis: X
-
timeBodyAccJerkStdY
- domain: Time
- source: Body
- sensor: Accelerometer
- jerk: Yes
- magnitude: No
- statistics: Standard Deviation
- axis: Y
-
timeBodyAccJerkStdZ
- domain: Time
- source: Body
- sensor: Accelerometer
- jerk: Yes
- magnitude: No
- statistics: Standard Deviation
- axis: Z
-
timeBodyGyroMeanX
- domain: Time
- source: Body
- sensor: Gyroscope
- jerk: No
- magnitude: No
- statistics: Mean
- axis: X
-
timeBodyGyroMeanY
- domain: Time
- source: Body
- sensor: Gyroscope
- jerk: No
- magnitude: No
- statistics: Mean
- axis: Y
-
timeBodyGyroMeanZ
- domain: Time
- source: Body
- sensor: Gyroscope
- jerk: No
- magnitude: No
- statistics: Mean
- axis: Z
-
timeBodyGyroStdX
- domain: Time
- source: Body
- sensor: Gyroscope
- jerk: No
- magnitude: No
- statistics: Standard Deviation
- axis: X
-
timeBodyGyroStdY
- domain: Time
- source: Body
- sensor: Gyroscope
- jerk: No
- magnitude: No
- statistics: Standard Deviation
- axis: Y
-
timeBodyGyroStdZ
- domain: Time
- source: Body
- sensor: Gyroscope
- jerk: No
- magnitude: No
- statistics: Standard Deviation
- axis: Z
-
timeBodyGyroJerkMeanX
- domain: Time
- source: Body
- sensor: Gyroscope
- jerk: Yes
- magnitude: No
- statistics: Mean
- axis: X
-
timeBodyGyroJerkMeanY
- domain: Time
- source: Body
- sensor: Gyroscope
- jerk: Yes
- magnitude: No
- statistics: Mean
- axis: Y
-
timeBodyGyroJerkMeanZ
- domain: Time
- source: Body
- sensor: Gyroscope
- jerk: Yes
- magnitude: No
- statistics: Mean
- axis: Z
-
timeBodyGyroJerkStdX
- domain: Time
- source: Body
- sensor: Gyroscope
- jerk: Yes
- magnitude: No
- statistics: Standard deviation
- axis: X
-
timeBodyGyroJerkStdY
- domain: Time
- source: Body
- sensor: Gyroscope
- jerk: Yes
- magnitude: No
- statistics: Standard deviation
- axis: Y
-
timeBodyGyroJerkStdZ
- domain: Time
- source: Body
- sensor: Gyroscope
- jerk: Yes
- magnitude: No
- statistics: Standard deviation
- axis: Z
-
timeBodyAccMagMean
- domain: Time
- source: Body
- sensor: Accelerometer
- jerk: No
- magnitude: No
- statistics: Mean
- axis: -
-
timeBodyAccMagStd
- domain: Time
- source: Body
- sensor: Accelerometer
- jerk: No
- magnitude: No
- statistics: Standard Deviation
- axis: -
-
timeGravityAccMagMean
- domain: Time
- source: Gravity
- sensor: Accelerometer
- jerk: No
- magnitude: Yes
- statistics: Mean
- axis: -
-
timeGravityAccMagStd
- domain: Time
- source: Gravity
- sensor: Accelerometer
- jerk: No
- magnitude: Yes
- statistics: Standard Deviation
- axis: -
-
timeBodyAccJerkMagMean
- domain: Time
- source: Body
- sensor: Accelerometer
- jerk: Yes
- magnitude: Yes
- statistics: Mean
- axis: -
-
timeBodyAccJerkMagStd
- domain: Time
- source: Body
- sensor: Accelerometer
- jerk: Yes
- magnitude: Yes
- statistics: Standard Deviation
- axis: -
-
timeBodyGyroMagMean
- domain: Time
- source: Body
- sensor: Gyroscope
- jerk: No
- magnitude: Yes
- statistics: Mean
- axis: -
-
timeBodyGyroMagStd
- domain: Time
- source: Body
- sensor: Gyroscope
- jerk: No
- magnitude: Yes
- statistics: Standard Deviation
- axis: -
-
timeBodyGyroJerkMagMean
- domain: Time
- source: Body
- sensor: Accelerometer
- jerk: Yes
- magnitude: Yes
- statistics: Mean
- axis: -
-
timeBodyGyroJerkMagStd
- domain: Time
- source: Body
- sensor: Gyroscope
- jerk: Yes
- magnitude: Yes
- statistics: Standard Deviation
- axis: -
-
freqBodyAccMeanX
- domain: Frequency
- source: Body
- sensor: Accelerometer
- jerk: No
- magnitude: No
- statistics: Mean
- axis: X
-
freqBodyAccMeanY
- domain: Frequency
- source: Body
- sensor: Accelerometer
- jerk: No
- magnitude: No
- statistics: Mean
- axis: Y
-
freqBodyAccMeanZ
- domain: Frequency
- source: Body
- sensor: Accelerometer
- jerk: No
- magnitude: No
- statistics: Mean
- axis: Z
-
freqBodyAccStdX
- domain: Frequency
- source: Body
- sensor: Accelerometer
- jerk: No
- magnitude: No
- statistics: Standard Deviation
- axis: X
-
freqBodyAccStdY
- domain: Frequency
- source: Body
- sensor: Accelerometer
- jerk: No
- magnitude: No
- statistics: Standard Deviation
- axis: Y
-
freqBodyAccStdZ
- domain: Frequency
- source: Body
- sensor: Accelerometer
- jerk: No
- magnitude: No
- statistics: Standard Deviation
- axis: X
-
freqBodyAccJerkMeanX
- domain: Frequency
- source: Body
- sensor: Accelerometer
- jerk: Yes
- magnitude: No
- statistics: Mean
- axis: X
-
freqBodyAccJerkMeanY
- domain: Frequency
- source: Body
- sensor: Accelerometer
- jerk: Yes
- magnitude: No
- statistics: Mean
- axis: Y
-
freqBodyAccJerkMeanZ
- domain: Frequency
- source: Body
- sensor: Accelerometer
- jerk: Yes
- magnitude: No
- statistics: Mean
- axis: Z
-
freqBodyAccJerkStdX
- domain: Frequency
- source: Body
- sensor: Accelerometer
- jerk: Yes
- magnitude: No
- statistics: Standard Deviation
- axis: X
-
freqBodyAccJerkStdY
- domain: Frequency
- source: Body
- sensor: Accelerometer
- jerk: Yes
- magnitude: No
- statistics: Standard Deviation
- axis: Y
-
freqBodyAccJerkStdZ
- domain: Frequency
- source: Body
- sensor: Accelerometer
- jerk: Yes
- magnitude: No
- statistics: Standard Deviation
- axis: Z
-
freqBodyGyroMeanX
- domain: Frequency
- source: Body
- sensor: Gyroscope
- jerk: No
- magnitude: No
- statistics: Mean
- axis: X
-
freqBodyGyroMeanY
- domain: Frequency
- source: Body
- sensor: Gyroscope
- jerk: No
- magnitude: No
- statistics: Mean
- axis: Y
-
freqBodyGyroMeanZ
- domain: Frequency
- source: Body
- sensor: Gyroscope
- jerk: No
- magnitude: No
- statistics: Mean
- axis: Z
-
freqBodyGyroStdX
- domain: Frequency
- source: Body
- sensor: Gyroscope
- jerk: No
- magnitude: No
- statistics: Standard Deviation
- axis: X
-
freqBodyGyroStdY
- domain: Frequency
- source: Body
- sensor: Gyroscope
- jerk: No
- magnitude: No
- statistics: Standard Deviation
- axis: Y
-
freqBodyGyroStdZ
- domain: Frequency
- source: Body
- sensor: Gyroscope
- jerk: No
- magnitude: No
- statistics: Standard Deviation
- axis: Z
-
freqBodyAccMagMean
- domain: Frequency
- source: Body
- sensor: Accelerometer
- jerk: No
- magnitude: Yes
- statistics: Mean
- axis: -
-
freqBodyAccMagStd
- domain: Frequency
- source: Body
- sensor: Accelerometer
- jerk: No
- magnitude: Yes
- statistics: Standard Deviation
- axis: -
-
freqBodyAccJerkMagMean
- domain: Frequency
- source: Body
- sensor: Accelerometer
- jerk: Yes
- magnitude: Yes
- statistics: Mean
- axis: -
-
freqBodyAccJerkMagStd
- domain: Frequency
- source: Body
- sensor: Accelerometer
- jerk: Yes
- magnitude: Yes
- statistics: Mean
- axis: -
-
freqBodyGyroMagMean
- domain: Frequency
- source: Body
- sensor: Gyroscope
- jerk: No
- magnitude: Yes
- statistics: Mean
- axis: -
-
freqBodyGyroMagStd
- domain: Frequency
- source: Body
- sensor: Gyroscope
- jerk: No
- magnitude: Yes
- statistics: Standard Deviation
- axis:
-
freqBodyGyroJerkMagMean
- domain: Frequency
- source: Body
- sensor: Gyroscope
- jerk: Yes
- magnitude: Yes
- statistics: Mean
- axis:
-
freqBodyGyroJerkMagStd
- domain: Frequency
- source: Body
- sensor: Gyroscope
- jerk: Yes
- magnitude: Yes
- statistics: Standard Deviation
- axis: