In accordance with various embodiments, a method is performed at an electronic device including a display device and one or more input devices. The method includes displaying, on the display device, a first graphing area presenting a plot of a first set of data points for a first variable versus a first set of data points for a second variable. The method includes displaying, on the display device, an indication of a relationship between the first variable and the second variable. The method includes detecting, via the one or more input devices, a user input indicative of change to the relationship between the first variable and the second variable. The method includes determining, based on the changed relationship between the first variable and the second variable, a second set of data points. The method includes displaying, on the display device, a second graphing area presenting a plot of the second set of data points.