where the uncertainty is given as the standard deviation of the measured value from its expected value. There are a number of other such pairs of physically measurable values which obey a similar rule. One example is time vs. energy. The either-or nature of uncertainty forces measurement attempts to choose between trade offs, and given that they are quanta, the trade offs often take the form of either-or (as in Fourier analysis), rather than the compromises and gray areas of time series analysis.
 What measurable value obeys a similar rule of angular momentum? What forces measurement attempts to choose between trade-offs, in quanta? What form do measurement attempt trade-offs for quanta take the form of? How is uncertainly measured in this experience? What type of analysis fits the either-or nature of the uncertainty? What example is given as another paired relationship of uncertainly related to standard deviation?