Allan's-variance.md

-Allan variance is a statistical method for measuring the stability and accuracy of a time and frequency signal over time. It was first introduced by David W. Allan in 1966, and it is widely used to analyze the performance of oscillators, clocks, and other time-keeping devices.
+Allan variance is a statistical method for measuring the stability and accuracy of a time and frequency signal over time. It was first introduced by _David W. Allan_ in **1966**, and it is widely used to analyze the performance of oscillators, clocks, and other time-keeping devices.
 
-Allan variance is a measure of the frequency stability of a signal over time, and it is calculated by dividing the data into overlapping segments, and then calculating the variance of the frequency or phase differences between each segment. It is represented by the symbol, "σy²(τ)" where τ is the averaging time.
+Allan variance is a measure of the frequency stability of a signal over time, and it is calculated by dividing the data into overlapping segments, and then calculating the variance of the frequency or phase differences between each segment. It is represented by the symbol, **"σy²(τ)"** where τ is the averaging time.
 
 The Allan variance is usually plotted as a function of the averaging time, and the resulting plot is called the Allan deviation. The Allan deviation plot allows for the analysis of the stability of the signal over different time scales.