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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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METHOD Subcommand<br />

NPAR TESTS 1101<br />

METHOD displays additional results for each statistic requested. If no METHOD subcommand<br />

is specified, the standard asymptotic results are displayed. If fractional weights have been<br />

specified, results for all methods will be calculated on the weight rounded to the nearest<br />

integer. This subcommand is available only if the SPSS Exact Tests option has been installed.<br />

MC Displays an unbiased point estimate and confidence interval based on the<br />

Monte Carlo sampling method, for all statistics. Asymptotic results are also<br />

displayed. When exact results can be calculated, they will be provided instead<br />

of the Monte Carlo results. See SPSS Exact Tests for details of the situations<br />

under which exact results are provided instead of Monte Carlo results.<br />

CIN(n) Controls the confidence level for the Monte Carlo estimate. CIN is available<br />

only when /METHOD=MC is specified. CIN has a default value of 99.0. You<br />

can specify a confidence interval between 0.01 and 99.9, inclusive.<br />

SAMPLES Specifies the number of tables sampled from the reference set when calculating<br />

the Monte Carlo estimate of the exact p value. Larger sample sizes lead to<br />

narrower confidence limits but also take longer to calculate. You can specify<br />

any integer between 1 and 1,000,000,000 as the sample size. SAMPLES has a<br />

default value of 10,000.<br />

EXACT Computes the exact significance level for all statistics, in addition to the<br />

asymptotic results. If both the EXACT and MC keywords are specified, only<br />

exact results are provided. Calculating the exact p value can be memoryintensive.<br />

If you have specified /METHOD=EXACT and find that you have<br />

insufficient memory to calculate results, you should first close any other<br />

applications that are currently running in order to make more memory available.<br />

You can also enlarge the size of your swap file (see your Windows<br />

manual for more information). If you still cannot obtain exact results, specify<br />

/METHOD=MC to obtain the Monte Carlo estimate of the exact p value. An<br />

optional TIMER keyword is available if you choose /METHOD=EXACT.<br />

TIMER(n) Specifies the maximum number of minutes allowed to run the exact analysis<br />

for each statistic. If the time limit is reached, the test is terminated, no exact<br />

results are provided, and the program begins to calculate the next test in the<br />

analysis. TIMER is available only when /METHOD=EXACT is specified. You<br />

can specify any integer value for TIMER. Specifying a value of 0 for TIMER<br />

turns the timer off completely. TIMER has a default value of 5 minutes. If a<br />

test exceeds a time limit of 30 minutes, it is recommended that you use the<br />

Monte Carlo, rather than the exact, method.<br />

<strong>Reference</strong>s<br />

Siegel, S. 1956. Nonparametric statistics for the behavioral sciences. New York: McGraw-Hill.

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