run_analysis: opens a zip file "getdata_projectfiles_UCI HAR Dataset.zip" within the same database column names are gathered from "features.txt" activities are matched using "activity-labels.txt" collects the names of the files contained within the zip file into train_data and test_data avg_train and avg_test contain only columns from their respective train_data and test_data that contain either "mean" or "std" these avg dataframes are combined and saved as "Step5data.txt" the avg dataframes are grouped by subject then activity into grouped_train and grouped_test then summarised by mean and printed to the console