combine_data            Import depth statistics and combine with PC
                        scores
create_depth_stats      Create depth statistics
create_wavelet          Create and plot the wavelet power spectrum
create_wavelet_stats    create_wavelet_stats
import_tag_data         Load time-depth series data from csv file
k_clustering            Perform k-means
pca_data                Prepare all data for Principal Component
                        Analysis
pca_results             Perform Principal Component Analysis
pca_scores              Calculate Principal Component Analysis Scores
                        not including depth statistics
plot_TDR                Plot the time-series depth dataset
plot_cluster_TDR        Plot the time-series depth records of the
                        selected tag. Colour days by cluster
plot_clusters           Plot the time-series depth records of the days
                        closest to the centre of each cluster
select_k                Perform k selection
