CodeBook.md

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title: "CodeBook"

CodeBook for "Getting and Cleaning data" project:

Variables:

• Subject subject variable is an integer dat type ranging from 1 -30.

• Activity Activity variable has 6 values.

  • WALKING : Person was walking.
  • WALKING_UPSTAIRS : Person was walking upstairs.
  • WALKING_DOWNSTAIRS : Person was walking downstairs.
  • SITTING : Person was sitting.
  • STANDING : Person was standing.
  • Laying : Person was laying down.

Measurements:

• Time-domain signals
• Frequency-domain signals

Transformations:

• The training and test datasets were merged into one dataset.
• The measurements on mean and standard deviation were selected for each measurement and others were omitted.
• The activity identifiers were replaced with decriptive activity names.
• The variable names were replaced with descriptive variable names, expanded the names , removed the special characters (, -), intial f and t were expanded to frequency and time, several terms like acc, gyro etc were expanded.
• Final dataset was created with the mean of each varibale for each activity and each subject.