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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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362 CSPLAN<br />

RATE Subcommand<br />

The RATE subcommand specifies the percentage of units to draw at the current stage, i.e., the<br />

sampling fraction.<br />

• Specify a single value, a variable name, or a matrix of rates for design strata. In all cases<br />

the value 1 is treated as 100%.<br />

• Rate values must be positive.<br />

• RATE is ignored with a warning if the PPS_MURTHY or PPS_BREWER method is specified.<br />

• Either SIZE or RATE must be specified for each stage. An error occurs if both are specified.<br />

VALUE Apply a single value to all strata. For example, VALUE=.10 selects 10 percent<br />

of units per stratum.<br />

MATRIX Specify disproportionate rates for different strata. Specify one or more variables<br />

after the MATRIX keyword. Then provide one rate specification per<br />

stratum. A rate specification includes a set of category values and a rate value.<br />

Category values should be listed in the same order as variables to which<br />

they apply. Semicolons are used to separate the rate specifications.<br />

For example, the following syntax selects 10 percent of units from the North<br />

stratum and 20 from the South stratum:<br />

/RATE MATRIX=region; ‘North’ .1; ‘South’ .2<br />

If there is more one than variable, specify one rate per combination of strata.<br />

For example, the following syntax specifies rate values for combinations of<br />

Region and Sex strata:<br />

/RATE MATRIX=region sex; ‘North’ ‘Male’ .1; ‘North’ ‘Female’ .15; ‘South’ ‘Male’<br />

.24; ‘South’ ‘Female’ .3<br />

The variable list must contain all or a subset of stratification variables from<br />

the same and previous stages and cluster variables from the previous stages.<br />

An error occurs if the list contains variables that are not defined as strata or<br />

cluster variables.<br />

Each rate specification must contain one category value per variable. If multiple<br />

rate specifications are provided for the same strata or combination of<br />

strata only the last one is honored.<br />

String and date category values must be quoted.<br />

A semicolon must appear after the variable list and after each rate specification.<br />

The semicolon is not allowed after the last rate specification.<br />

VARIABLE Specify the name of a single variable that contains the sample rates.

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