CodeBook.md

Data Dictionary - Human Activity Recognition Using Smartphones Data Set

subjects

Subject who performed the activity for each window sample

    1..30 .Unique identifier assigned to each subject

activities

Name of the activities

    1 .LAYING
    2 .SITTING
    3 .STANDING
    4 .WALKING
    5 .WALKING_DOWNSTAIRS
    6 .WALKING_UPSTAIRS

variable

Descriptive variable names

    1 .tBodyAcc-mean()-X
    2 .tBodyAcc-mean()-Y
    3 .tBodyAcc-mean()-Z
    4 .tBodyAcc-std()-X
    5 .tBodyAcc-std()-Y
    6 .tBodyAcc-std()-Z
    7 .tGravityAcc-mean()-X
    8 .tGravityAcc-mean()-Y
    9 .tGravityAcc-mean()-Z
    10 .tGravityAcc-std()-X
    11 .tGravityAcc-std()-Y
    12 .tGravityAcc-std()-Z
    13 .tBodyAccJerk-mean()-X
    14 .tBodyAccJerk-mean()-Y
    15 .tBodyAccJerk-mean()-Z
    16 .tBodyAccJerk-std()-X
    17 .tBodyAccJerk-std()-Y
    18 .tBodyAccJerk-std()-Z
    19 .tBodyGyro-mean()-X
    20 .tBodyGyro-mean()-Y
    21 .tBodyGyro-mean()-Z
    22 .tBodyGyro-std()-X
    23 .tBodyGyro-std()-Y
    24 .tBodyGyro-std()-Z
    25 .tBodyGyroJerk-mean()-X
    26 .tBodyGyroJerk-mean()-Y
    27 .tBodyGyroJerk-mean()-Z
    28 .tBodyGyroJerk-std()-X
    29 .tBodyGyroJerk-std()-Y
    30 .tBodyGyroJerk-std()-Z
    31 .tBodyAccMag-mean()
    32 .tBodyAccMag-std()
    33 .tGravityAccMag-mean()
    34 .tGravityAccMag-std()
    35 .tBodyAccJerkMag-mean()
    36 .tBodyAccJerkMag-std()
    37 .tBodyGyroMag-mean()
    38 .tBodyGyroMag-std()
    39 .tBodyGyroJerkMag-mean()
    40 .BodyGyroJerkMag-std()
    41 .fBodyAcc-mean()-X
    42 .fBodyAcc-mean()-Y
    43 .fBodyAcc-mean()-Z
    44 .fBodyAcc-std()-X
    45 .fBodyAcc-std()-Y
    46 .fBodyAcc-std()-Z
    47 .fBodyAcc-meanFreq()-X
    48 .fBodyAcc-meanFreq()-Y
    49 .fBodyAcc-meanFreq()-Z
    50 .fBodyAccJerk-mean()-X
    51 .fBodyAccJerk-mean()-Y
    52 .fBodyAccJerk-mean()-Z
    53 .fBodyAccJerk-std()-X
    54 .fBodyAccJerk-std()-Y
    55 .fBodyAccJerk-std()-Z
    56 .fBodyAccJerk-meanFreq()-X
    57 .fBodyAccJerk-meanFreq()-Y
    58 .fBodyAccJerk-meanFreq()-Z
    59 .fBodyGyro-mean()-X
    60 .fBodyGyro-mean()-Y
    61 .fBodyGyro-mean()-Z
    62 .fBodyGyro-std()-X
    63 .fBodyGyro-std()-Y
    64 .fBodyGyro-std()-Z
    65 .fBodyGyro-meanFreq()-X
    66 .fBodyGyro-meanFreq()-Y
    67 .fBodyGyro-meanFreq()-Z
    68 .fBodyAccMag-mean()
    69 .fBodyAccMag-std()
    70 .fBodyAccMag-meanFreq()
    71 .fBodyBodyAccJerkMag-mean()
    72 .fBodyBodyAccJerkMag-std()
    73 .fBodyBodyAccJerkMag-meanFreq()
    74 .fBodyBodyGyroMag-mean()
    75 .fBodyBodyGyroMag-std()
    76 .fBodyBodyGyroMag-meanFreq()
    77 .fBodyBodyGyroJerkMag-mean()
    78 .fBodyBodyGyroJerkMag-std()
    79 .fBodyBodyGyroJerkMag-meanFreq()
    80 .angle(tBodyAccMean,gravity)
    81 .angle(tBodyAccJerkMean),gravityMean)
    82 .angle(tBodyGyroMean,gravityMean)
    83 .angle(tBodyGyroJerkMean,gravityMean)
    84 .angle(X,gravityMean)
    85 .angle(Y,gravityMean)
    86 .angle(Z,gravityMean)

average

Average of each variable for each activity and each subject

    -1..1 .Normalized and bounded within [-1,1]