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Sample spectrum plot

  • Question:
    How many cyclic components?
    Dominant cyclic frequencies?

  • Definition:
    Vertical Axis: Variance (Power)
    Horizontal Axis: Frequency (cycles per observation)

  • Interpretation/Conclusion:
    Only 1 dominant frequency
    Dominant frequency near .3 cycles/observation

  • NIST/SEMATECH Handbook Chapter:
    1. Process/Product Exploration

  • Reference:
    Jenkins and Watts (1968), Spectral Applications and Its Applications, Holden-Day.

    Bloomfield (1976), Fourier Analysis of Time Series, John Wiley and Sons.

    Granger and Jatanaka (1964), Spectral Analysis of Economic Time Series, Princeton University Press.

Dataplot Command: SPECTRUM Y
Dataplot Code:
SKIP 25
READ LEW.DAT Y
SPECTRUM Y

Dataplot Reference Manual Documentation for SPECTRUM


Date created: 06/05/2001
Last updated: 02/13/2023

Please email comments on this WWW page to alan.heckert@nist.gov.