Least Squares computes and displays linear regression of 2D points. Touch the Edit button to enter 2D points using a table editor. Touch-hold the graph to send it to others or touch a data point to see its value. The single-purpose user interface is intended to be easy to use. If you need more features (which results in additional complexity) then try the Expert setting. The Expert setting enables data fetching from the web, skins and many other features. Either way, Easy or Expert, there are options to help visualize your data.