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'''Time deviation (TDEV)'''<ref name=NISTSP1065>[http://tf.nist.gov/timefreq/general/pdf/2220.pdf NIST SP 1065: Handbook of Frequency Stability Analysis]</ref> also known as <math>\sigma_x(\tau)</math> is the time stability of phase ''x'' versus observation interval τ of the measured clock source. The time deviation thus forms a standard deviation type of measurement to indicate the time instability of the signal source. This is a scaled variant of frequency stability of [[Allan deviation]]. It is commonly defined from the [[modified Allan deviation]], but other estimators may be used.
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''Time variance'' (''TVAR'') also known as <math>\sigma_x^2(\tau)</math> is the time stability of phase versus observation interval tau. It is a scaled variant of [[Modified Allan variance]].
 
TDEV is a metric often used to determine an aspect of the quality of [[Synchronization_in_telecommunications|timing signals in telecommunication applications]] and is a statistical analysis of the phase stability of a signal over a given period. Measurements of a reference timing signal will refer to its TDEV and [[maximum time interval error]] (MTIE) values, comparing them to specified masks or goals.
 
==Definition==
 
The most common estimator uses the [[modified Allan variance]]
 
:<math>\sigma_x^2(\tau) = \frac{\tau^2}{3}\operatorname{mod}\sigma_y^2(n\tau_0)</math>
 
where <math>\tau = n\tau_o</math>. The 3 in the denominator normalizes TVAR to be equal to the classical variance if the deviations in x are random and uncorrelated (white-noise).
 
or TDEV, which is the square-root of TVAR, may be derived from MDEV [[modified Allan deviation]]
 
:<math>\sigma_x(\tau) = \frac{\tau}{\sqrt{3}}\operatorname{mod}\sigma_y(n\tau_0)</math>
 
==References==
{{reflist}}
 
 
{{statistics-stub}}
 
[[Category:Signal processing metrics]]
[[Category:Measurement]]

Latest revision as of 18:21, 14 May 2014

Making sure you have the correct size is very important; a poor fitting helmet can be uncomfortable and unsafe. Therefore, you ought to verify the fork, the wheels and the suspensions together with two or three particulars. While a well trained dolphin is not as intimidating as a close encounter with a 230 kg wild animal is a totally different experience. Music sounds better with a background like the Continental Divide, and you simply may find out once and for all, as there are music vacations and concerts happening just about each weekend in the summertime. The music lineup features The Sierra Drifters from South Lake Tahoe, the Mark Sexton Band from Reno, and Lazy - Man from Healdsburg, with DJ Berkmon spinning great beats in between sets.

Therefore all sides of the square are of equal length. By just taking a few minutes to make sure your bike is well-tuned before you set out, you can keep from spending hours on issues later. Each rider has lanes, but some others only have a single lane. You can travel on the equivalent of 10 cents a gallon of gas. If you are riding through a rock garden, for instance, you don't want a fork that is bouncing you all over the place.

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