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SPSS® 12.0 Command Syntax Reference

SPSS® 12.0 Command Syntax Reference

SPSS® 12.0 Command Syntax Reference

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PPLOT 1229<br />

Q-Q Quantile-quantile plots. The quantiles of the observed values are plotted against the<br />

quantiles of the specified distribution.<br />

P-P Proportion-proportion plots. The observed cumulative proportion is plotted<br />

against the expected cumulative proportion if the data were a sample from a specified<br />

distribution.<br />

Figure 1 Normal q-q plot of current salary<br />

Figure 2 Normal p-p plot of current salary<br />

PLOT Subcommand<br />

PLOT specifies whether to produce a plot of observed values versus expected values, a plot<br />

of observed values versus deviations from expected values, or both. Figure 1 and Figure 2<br />

are nondetrended plots. Figure 3 shows a detrended q-q plot.<br />

BOTH Display both detrended and nondetrended normal plots. This is the default.<br />

NORMAL Display nondetrended normal plots. The observed values are plotted against<br />

the expected values.<br />

DETRENDED Display detrended plots. The observed values are plotted against the deviations<br />

from the expected values.<br />

• If you specify PLOT more than once, only the last specification is executed.<br />

• Deviations are calculated by subtracting the expected value from the observed value.

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