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CodeBook

Variables

Main Vars

data : binded x, y, s, then "extracts only the measurements on the mean and standard deviation for each measurement"
summary : a second, independent tidy data set with the average of each variable for each activity and each subject from 'data'.
summary2: a second, independent tidy data set with the average of each variable for each activity and each subject from 'x'.

Others Vars

test and train : temp vars for read test/_test.txt and train/_train.txt.
x : raw data from test/X_test.txt and train/X_train.txt
y : raw data from test/y_test.txt and train/y_train.txt
s : raw data from test/subject_test.txt and train/subject_train.txt
condi : temp var for "extracts only the measurements on the mean and standard deviation for each measurement"
lbls and act : temp vars for "Uses descriptive activity names to name the activities in the data set"

Output

tidy-1.txt

result of:

Merges the training and the test sets to create one data set.
Extracts only the measurements on the mean and standard deviation for each measurement.
Uses descriptive activity names to name the activities in the data set
Appropriately labels the data set with descriptive variable names.

tidy-2-mean_std_only.txt

a tidy data set with the average of each variable for each activity and each subject from 'data (or tidy-1.txt)'.

It is extracted only the measurements on the mean and standard deviation for each measurement.

tidy-2-all.txt

a tidy data set with the average of each variable for each activity and each subject from 'x (or test/X_test.txt and train/X_train.txt)'.

It is Not extracted.