R exercise analysis on : Time Series Data $$ The dataset HAR$\_$walk.txt was collected in a laboratory setting, using the exact procedure outlined in Sikder & Nahid $(2021).$ To summarise, participants performed a walking$-$related activity for $3$ seconds, while recordings were made via a smartphone $($see Figure $2).$ Data pre$-$processing has also been performed using the exact procedure outlined in Sikder & Nahid $(2021).$ The dataset HAR$\_$walk.txt consists of accelerometer signals and gyroscope signals $($in each of the $,$ and $$ directions$)$ recorded at $300$ time points. An example set of six time series is displayed in Figure $3.$ The dataset HAR$\_$walk.txt contains $900$ observations $(324$ walking forwards, $317$ walking backwards and $259$ walking in a circular motion$).$ The class labels are in column $1801($labelled $$Type$).$