## A simulation of the fluctuations of international atomic time |

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01 1 Frequency A2xt Appendix Atomic Time James Atomic Time Scale Auto Regressive automatic data processing Basic Standards BIH model Bode plot Building an ARIMA Bureau BIH BUREAU OF STANDARDS Center COMPUTER SCIENCES cycles per data difference operator equivalent e4B4)at where xt Equation filter cascade Flicker frequency noise flicker noise fluctuations in nanoseconds Fluctuations of International following divisions Frequency cycles/10 days Frequency Fig Frequency stability index-lowering operator Institute consists Institute for Basic International Atomic International Time Bureau levels which model MATERIALS RESEARCH Measurement System Model to Fit Moving Average nanoseconds ns NATIONAL BUREAU noise levels normal distribution numbers operator defined PERFORMING ORGANIZATION physical measurement power spectral densities Random walk frequency Report for 1975 resulting ARIMA model SCIENCES AND TECHNOLOGY simulated data square root Standard Reference Materials stationary Sx(f transfer function two-sample variance U.S. GOVERNMENT PRINTING variance of 147 walk frequency noise White phase noise zero mean