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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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The Process Performance Indices<br />

PP Performance of the process.<br />

SPCHART 1519<br />

PPU The distance between the process mean and the upper specification limit<br />

scaled by process standard deviation.<br />

PPL The distance between the process mean and the lower specification limit<br />

scaled by process standard deviation.<br />

PPK Performance of process related to both dispersion and centeredness. It is the<br />

minimum of PpU and PpL. If only one specification limit is provided, we<br />

compute and report a unilateral PpK instead of taking the minimum.<br />

PR The reciprocal of PP.<br />

PPM An index relating process variance and the difference between the process<br />

mean and the target value. A target value must be specified on the TARGET<br />

subcommand by the user.<br />

PZU The number of standard deviations between the process mean and the upper<br />

specification limit.<br />

PZL The number of standard deviations between the process mean and the lower<br />

specification limit.<br />

PZMIN The minimum number of standard deviations between the process mean and<br />

the specification limits.<br />

PZMAX The maximum number of standard deviations between the process mean and<br />

the specification limits.<br />

PZOUT The estimated percentage outside the specification limits. The standard normal<br />

approximation is based on the PZ U and PZ L.<br />

• For each of the keywords other than PPK, both of the LSL subcommand and the USL<br />

subcommand must be specified. Otherwise, we ignore the keyword(s) and issue a syntax<br />

warning. For PPK, at least one of the LSL and USL subcommands must be specified.<br />

• The keyword PPM is ignored with a syntax warning, if the TARGET subcommand is not<br />

specified.<br />

Measure(s) for Assessing Normality<br />

AZOUT The observed percentage outside the specification limits. A point is defined<br />

outside the specification limits, when its value is greater than or equal to the<br />

USL or is less than or equal to the LSL.<br />

• For AZOUT, both of the LSL subcommand and the USL subcommand must be specified.<br />

Otherwise, we ignore the keyword and issue a syntax warning.

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