But in general they modulate the output current by varying the input signal in an analogue fashion — as utilised in amplifiers, analogue radios and many other devices. (newscientist.com)
To allow for track or forecast uncertainties, usually several model runs with varying input parameters are generated to create a map of MOMs, or Maximum of Maximums. (en.wikipedia.org)
By varying the inputs of goal weight, number of days (or date) to reach that weight, percentage calories changed and percentage of exercise activity changed, it really helps you zero in on a realistic expectation of what reaching your goal weight will take, as well as gives you a chart of your daily weight along with an error balloon either side. (naturalchoiceswellness.com)