CENTER Subcommand (SPECTRA command)

CENTER adjusts the series to have a mean of 0. This process reduces the range of values that are displayed in the plots.

• If CENTER is not specified, the ordinate of the first periodogram value is 2n times the square of the mean of the series, where n is the number of cases.
• You can specify CENTER NO to suppress centering when applying a previous model with APPLY.

Example

SPECTRA VARIABLES = VARX VARY
  /CENTER.

• This example produces the default display for VARX and VARY. The plots are based on the series after their means have been adjusted to 0.