CodeBook.md

Code Book - TidyData.txt

• [column 1]Activities (char): The descriptive names of the six activities in the experiment
  column contents:

  • "WALKING"
  • "WALKING_UPSTAIRS"
  • "WALKING_DOWNSTAIRS"
  • "SITTING"
  • "STANDING"
  • "LAYING"

• [column 2]Subjects (int): The integer numbers stand for the 30 voluteers in the experiment
  column contents:

  • 1-30

• [column 3]Group (char): The partition data set that the voluteers belongs to
  column contents:

  • "test"
  • "train"

• [column 4-69]The Average Mean and Standard Deviation of the measurements (double): The average of each variable for each activity and each subject
  The meaning of the varible name in code:

  • prefix "t": time domain signals
  • prefix "f": frequency domain signals
  • "BodyAcc": Body acceleration signals
  • "GravityAcc": Gravity acceleration signals
  • "BodyGyro": Body gyroscope signals
  • "Jerk": The signal derived in time
  • "Mag": The signals calculated using the Euclidean norm
  • "-X": measure in X axis of the phone
  • "-Y": measure in Y axis of the phone
  • "-Z": measure in Z axis of the phone
  • "-mean()": Mean value
  • "-std()": Standard deviation