As discussed in Annex F, paragraph 4, data classifications for a VSD effort will be either sinusoidal, random, or a combination thereof. In the case of random data, there is an underlying assumption of stationarity and Gaussian probability density function characteristics. For cases in which the field data is clearly not stationary or not Gaussian, alternatives to the VSD techniques discussed in this document should be investigated. Techniques such as Time Waveform Replication (TWR), consists of the replication of either measured or analytically specified time trace(s) in the laboratory. TWR is a statistically non-parametric technique in which both spectral and temporal characteristics are preserved. For more information about TWR refer to Method 525.2.
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