Codebook

Variable list and descriptions

Variable name	Description
subject	ID the subject who performed the activity for each window sample. Its range is from 1 to 30.
activity	Activity name
featDomain	Feature: Time domain signal or frequency domain signal (Time or Freq)
featInstrument	Feature: Measuring instrument (Accelerometer or Gyroscope)
featAcceleration	Feature: Acceleration signal (Body or Gravity)
featVariable	Feature: Variable (Mean or SD)
featJerk	Feature: Jerk signal
featMagnitude	Feature: Magnitude of the signals calculated using the Euclidean norm
featAxis	Feature: 3-axial signals in the X, Y and Z directions (X, Y, or Z)
featCount	Feature: Count of data points used to compute `average`
featAverage	Feature: Average of each variable for each activity and each subject

Dataset structure

## Classes 'data.table' and 'data.frame':	11880 obs. of  11 variables:
##  $ subject         : int  1 1 1 1 1 1 1 1 1 1 ...
##  $ activity        : Factor w/ 6 levels "LAYING","SITTING",..: 1 1 1 1 1 1 1 1 1 1 ...
##  $ featDomain      : Factor w/ 2 levels "Time","Freq": 1 1 1 1 1 1 1 1 1 1 ...
##  $ featAcceleration: Factor w/ 3 levels NA,"Body","Gravity": 1 1 1 1 1 1 1 1 1 1 ...
##  $ featInstrument  : Factor w/ 2 levels "Accelerometer",..: 2 2 2 2 2 2 2 2 2 2 ...
##  $ featJerk        : Factor w/ 2 levels NA,"Jerk": 1 1 1 1 1 1 1 1 2 2 ...
##  $ featMagnitude   : Factor w/ 2 levels NA,"Magnitude": 1 1 1 1 1 1 2 2 1 1 ...
##  $ featVariable    : Factor w/ 2 levels "Mean","SD": 1 1 1 2 2 2 1 2 1 1 ...
##  $ featAxis        : Factor w/ 4 levels NA,"X","Y","Z": 2 3 4 2 3 4 1 1 2 3 ...
##  $ count           : int  50 50 50 50 50 50 50 50 50 50 ...
##  $ average         : num  -0.0166 -0.0645 0.1487 -0.8735 -0.9511 ...
##  - attr(*, "sorted")= chr  "subject" "activity" "featDomain" "featAcceleration" ...
##  - attr(*, ".internal.selfref")=<externalptr>

List the key variables in the data table

## [1] "subject"          "activity"         "featDomain"
## [4] "featAcceleration" "featInstrument"   "featJerk"
## [7] "featMagnitude"    "featVariable"     "featAxis"

Show a few rows of the dataset

##        subject         activity featDomain featAcceleration featInstrument
##     1:       1           LAYING       Time               NA      Gyroscope
##     2:       1           LAYING       Time               NA      Gyroscope
##     3:       1           LAYING       Time               NA      Gyroscope
##     4:       1           LAYING       Time               NA      Gyroscope
##     5:       1           LAYING       Time               NA      Gyroscope
##    ---
## 11876:      30 WALKING_UPSTAIRS       Freq             Body  Accelerometer
## 11877:      30 WALKING_UPSTAIRS       Freq             Body  Accelerometer
## 11878:      30 WALKING_UPSTAIRS       Freq             Body  Accelerometer
## 11879:      30 WALKING_UPSTAIRS       Freq             Body  Accelerometer
## 11880:      30 WALKING_UPSTAIRS       Freq             Body  Accelerometer
##        featJerk featMagnitude featVariable featAxis count  average
##     1:       NA            NA         Mean        X    50 -0.01655
##     2:       NA            NA         Mean        Y    50 -0.06449
##     3:       NA            NA         Mean        Z    50  0.14869
##     4:       NA            NA           SD        X    50 -0.87354
##     5:       NA            NA           SD        Y    50 -0.95109
##    ---
## 11876:     Jerk            NA           SD        X    65 -0.56157
## 11877:     Jerk            NA           SD        Y    65 -0.61083
## 11878:     Jerk            NA           SD        Z    65 -0.78475
## 11879:     Jerk     Magnitude         Mean       NA    65 -0.54978
## 11880:     Jerk     Magnitude           SD       NA    65 -0.58088

Summary of variables

##     subject                   activity    featDomain  featAcceleration
##  Min.   : 1.0   LAYING            :1980   Time:7200   NA     :4680
##  1st Qu.: 8.0   SITTING           :1980   Freq:4680   Body   :5760
##  Median :15.5   STANDING          :1980               Gravity:1440
##  Mean   :15.5   WALKING           :1980
##  3rd Qu.:23.0   WALKING_DOWNSTAIRS:1980
##  Max.   :30.0   WALKING_UPSTAIRS  :1980
##        featInstrument featJerk      featMagnitude  featVariable featAxis
##  Accelerometer:7200   NA  :7200   NA       :8640   Mean:5940    NA:3240
##  Gyroscope    :4680   Jerk:4680   Magnitude:3240   SD  :5940    X :2880
##                                                                 Y :2880
##                                                                 Z :2880
##
##
##      count         average
##  Min.   :36.0   Min.   :-0.9977
##  1st Qu.:49.0   1st Qu.:-0.9621
##  Median :54.5   Median :-0.4699
##  Mean   :57.2   Mean   :-0.4844
##  3rd Qu.:63.2   3rd Qu.:-0.0784
##  Max.   :95.0   Max.   : 0.9745

List all possible combinations of features

##     featDomain featAcceleration featInstrument featJerk featMagnitude
##  1:       Time               NA      Gyroscope       NA            NA
##  2:       Time               NA      Gyroscope       NA            NA
##  3:       Time               NA      Gyroscope       NA            NA
##  4:       Time               NA      Gyroscope       NA            NA
##  5:       Time               NA      Gyroscope       NA            NA
##  6:       Time               NA      Gyroscope       NA            NA
##  7:       Time               NA      Gyroscope       NA     Magnitude
##  8:       Time               NA      Gyroscope       NA     Magnitude
##  9:       Time               NA      Gyroscope     Jerk            NA
## 10:       Time               NA      Gyroscope     Jerk            NA
## 11:       Time               NA      Gyroscope     Jerk            NA
## 12:       Time               NA      Gyroscope     Jerk            NA
## 13:       Time               NA      Gyroscope     Jerk            NA
## 14:       Time               NA      Gyroscope     Jerk            NA
## 15:       Time               NA      Gyroscope     Jerk     Magnitude
## 16:       Time               NA      Gyroscope     Jerk     Magnitude
## 17:       Time             Body  Accelerometer       NA            NA
## 18:       Time             Body  Accelerometer       NA            NA
## 19:       Time             Body  Accelerometer       NA            NA
## 20:       Time             Body  Accelerometer       NA            NA
## 21:       Time             Body  Accelerometer       NA            NA
## 22:       Time             Body  Accelerometer       NA            NA
## 23:       Time             Body  Accelerometer       NA     Magnitude
## 24:       Time             Body  Accelerometer       NA     Magnitude
## 25:       Time             Body  Accelerometer     Jerk            NA
## 26:       Time             Body  Accelerometer     Jerk            NA
## 27:       Time             Body  Accelerometer     Jerk            NA
## 28:       Time             Body  Accelerometer     Jerk            NA
## 29:       Time             Body  Accelerometer     Jerk            NA
## 30:       Time             Body  Accelerometer     Jerk            NA
## 31:       Time             Body  Accelerometer     Jerk     Magnitude
## 32:       Time             Body  Accelerometer     Jerk     Magnitude
## 33:       Time          Gravity  Accelerometer       NA            NA
## 34:       Time          Gravity  Accelerometer       NA            NA
## 35:       Time          Gravity  Accelerometer       NA            NA
## 36:       Time          Gravity  Accelerometer       NA            NA
## 37:       Time          Gravity  Accelerometer       NA            NA
## 38:       Time          Gravity  Accelerometer       NA            NA
## 39:       Time          Gravity  Accelerometer       NA     Magnitude
## 40:       Time          Gravity  Accelerometer       NA     Magnitude
## 41:       Freq               NA      Gyroscope       NA            NA
## 42:       Freq               NA      Gyroscope       NA            NA
## 43:       Freq               NA      Gyroscope       NA            NA
## 44:       Freq               NA      Gyroscope       NA            NA
## 45:       Freq               NA      Gyroscope       NA            NA
## 46:       Freq               NA      Gyroscope       NA            NA
## 47:       Freq               NA      Gyroscope       NA     Magnitude
## 48:       Freq               NA      Gyroscope       NA     Magnitude
## 49:       Freq               NA      Gyroscope     Jerk     Magnitude
## 50:       Freq               NA      Gyroscope     Jerk     Magnitude
## 51:       Freq             Body  Accelerometer       NA            NA
## 52:       Freq             Body  Accelerometer       NA            NA
## 53:       Freq             Body  Accelerometer       NA            NA
## 54:       Freq             Body  Accelerometer       NA            NA
## 55:       Freq             Body  Accelerometer       NA            NA
## 56:       Freq             Body  Accelerometer       NA            NA
## 57:       Freq             Body  Accelerometer       NA     Magnitude
## 58:       Freq             Body  Accelerometer       NA     Magnitude
## 59:       Freq             Body  Accelerometer     Jerk            NA
## 60:       Freq             Body  Accelerometer     Jerk            NA
## 61:       Freq             Body  Accelerometer     Jerk            NA
## 62:       Freq             Body  Accelerometer     Jerk            NA
## 63:       Freq             Body  Accelerometer     Jerk            NA
## 64:       Freq             Body  Accelerometer     Jerk            NA
## 65:       Freq             Body  Accelerometer     Jerk     Magnitude
## 66:       Freq             Body  Accelerometer     Jerk     Magnitude
##     featDomain featAcceleration featInstrument featJerk featMagnitude
##     featVariable featAxis   N
##  1:         Mean        X 180
##  2:         Mean        Y 180
##  3:         Mean        Z 180
##  4:           SD        X 180
##  5:           SD        Y 180
##  6:           SD        Z 180
##  7:         Mean       NA 180
##  8:           SD       NA 180
##  9:         Mean        X 180
## 10:         Mean        Y 180
## 11:         Mean        Z 180
## 12:           SD        X 180
## 13:           SD        Y 180
## 14:           SD        Z 180
## 15:         Mean       NA 180
## 16:           SD       NA 180
## 17:         Mean        X 180
## 18:         Mean        Y 180
## 19:         Mean        Z 180
## 20:           SD        X 180
## 21:           SD        Y 180
## 22:           SD        Z 180
## 23:         Mean       NA 180
## 24:           SD       NA 180
## 25:         Mean        X 180
## 26:         Mean        Y 180
## 27:         Mean        Z 180
## 28:           SD        X 180
## 29:           SD        Y 180
## 30:           SD        Z 180
## 31:         Mean       NA 180
## 32:           SD       NA 180
## 33:         Mean        X 180
## 34:         Mean        Y 180
## 35:         Mean        Z 180
## 36:           SD        X 180
## 37:           SD        Y 180
## 38:           SD        Z 180
## 39:         Mean       NA 180
## 40:           SD       NA 180
## 41:         Mean        X 180
## 42:         Mean        Y 180
## 43:         Mean        Z 180
## 44:           SD        X 180
## 45:           SD        Y 180
## 46:           SD        Z 180
## 47:         Mean       NA 180
## 48:           SD       NA 180
## 49:         Mean       NA 180
## 50:           SD       NA 180
## 51:         Mean        X 180
## 52:         Mean        Y 180
## 53:         Mean        Z 180
## 54:           SD        X 180
## 55:           SD        Y 180
## 56:           SD        Z 180
## 57:         Mean       NA 180
## 58:           SD       NA 180
## 59:         Mean        X 180
## 60:         Mean        Y 180
## 61:         Mean        Z 180
## 62:           SD        X 180
## 63:           SD        Y 180
## 64:           SD        Z 180
## 65:         Mean       NA 180
## 66:           SD       NA 180
##     featVariable featAxis   N

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codebook.md

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Codebook

Variable list and descriptions

Dataset structure

List the key variables in the data table

Show a few rows of the dataset

Summary of variables

List all possible combinations of features

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Codebook

Variable list and descriptions

Dataset structure

List the key variables in the data table

Show a few rows of the dataset

Summary of variables

List all possible combinations of features