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SPSS® 12.0 Command Syntax Reference

SPSS® 12.0 Command Syntax Reference

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1230 PPLOT<br />

• In low resolution, a dash is used in a detrended plot to indicate where the deviation from<br />

the expected is 0.<br />

Figure 3 Detrended normal q-q plot of current salary<br />

STANDARDIZE and NOSTANDARDIZE Subcommands<br />

STANDARDIZE transforms the sequence or time series variables into a sample with a mean<br />

of 0 and a standard deviation of 1. NOSTANDARDIZE indicates that the series should not<br />

be standardized and is the default.<br />

• There are no additional specifications on the STANDARDIZE or NOSTANDARDIZE<br />

subcommands.<br />

• Only the last STANDARDIZE or NOSTANDARDIZE subcommand on the PPLOT command<br />

is executed.<br />

• The STANDARDIZE and NOSTANDARDIZE subcommands have no effect on expected<br />

values, which are always standardized.<br />

• NOSTANDARDIZE is generally used with an APPLY subcommand to turn off a previous<br />

STANDARDIZE specification.<br />

Example<br />

PPLOT VARX<br />

/STANDARDIZE.<br />

• This example produces two q-q normal probability plots of VARX with standardized<br />

observed values.<br />

DIFF Subcommand<br />

DIFF specifies the degree of differencing used before plotting to convert a nonstationary<br />

variable to a stationary one with a constant mean and variance.<br />

• You can specify any positive integer on DIFF.<br />

• If DIFF is specified without a value, the default is 1.<br />

• The number of values plotted decreases by 1 for each degree of differencing.

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