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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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1096 NPAR TESTS<br />

MOSES Subcommand<br />

<strong>Syntax</strong><br />

Operations<br />

Example<br />

NPAR TESTS MOSES[(n)]=varlist BY variable(value1,value2)<br />

The MOSES test of extreme reactions tests whether the range of an ordinal variable is the same<br />

in a control group and a comparison group. The control and comparison groups are defined by<br />

a grouping variable. The output includes a Frequency table showing for each variable before<br />

BY the total number of cases and the number of cases in each group and a Test Statistics table<br />

showing the number of outliers removed, span of the control group before and after outliers<br />

are removed, and one-tailed probability of the span with and without outliers.<br />

• The minimum specification is a test variable, the keyword BY, a grouping variable, and<br />

two values in parentheses.<br />

• The test variable must be at least at the ordinal level of measurement.<br />

• The first value of the grouping variable defines the control group and the second value<br />

defines the comparison group.<br />

• By default, 5% of the cases are trimmed from each end of the range of the control group<br />

to remove outliers. You can override the default by specifying a value in parentheses<br />

following the MOSES subcommand keyword. This value represents an actual number of<br />

cases, not a percentage.<br />

• Values from the groups are arranged in a single ascending sequence. The span of the<br />

control group is computed as the number of cases in the sequence containing the lowest<br />

and highest control values.<br />

• No adjustments are made for tied cases.<br />

• Cases with values other than those specified for the grouping variable are excluded.<br />

• Test statistics are calculated for each variable named before BY.<br />

NPAR TESTS MOSES=V1 BY V3(0,1) /MOSES=V1 BY V3(1,0).<br />

• The first MOSES subcommand tests V1 using value 0 of V3 to define the control group<br />

and value 1 for the comparison group. The second MOSES subcommand reverses the<br />

comparison and control groups.

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