A random or stochastic process is a mathematical model for a phenomenon that evolves in time in an unpredictable manner from the viewp oint of the observer. The phenomenon may b e a sequence of real-valued measurements of voltage or temp erature, a binary data stream from a computer, a mod- ulated binary data stream from a modem, a sequence of coin tosses, the daily Dow–Jones average, radiometer data or photographs from deep space prob es, a sequence of images from a cable television, or any of an infinite numb er of p ossible sequences, waveforms
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