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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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1164 ONEWAY<br />

groups. In addition, homogeneous subsets are calculated and displayed in the Homogeneous<br />

Subsets table if the test is designed to detect homogeneity subsets.<br />

• When the number of valid cases in the groups varies, the harmonic mean of the group sizes<br />

is used as the sample size in the calculation for homogeneity subsets except for QREGW<br />

and FREGW. For QREGW and FREGW and tests for pairwise comparison, the sample sizes<br />

of individual groups are always used.<br />

• You can specify only one POSTHOC subcommand per ONEWAY command. If more than<br />

one is specified, the last specification takes effect.<br />

• You can specify one alpha value used in all POSTHOC tests using keyword ALPHA. The<br />

default is 0.05.<br />

SNK Student-Newman-Keuls procedure based on the Studentized range<br />

test. Used for detecting homogeneity subsets.<br />

TUKEY Tukey’s honestly significant difference. This test uses the Studentized<br />

range statistic to make all pairwise comparisons between groups. Used<br />

for pairwise comparison and for detecting homogeneity subsets.<br />

BTUKEY Tukey’s b. Multiple comparison procedure based on the average of<br />

Studentized range tests. Used for detecting homogeneity subsets.<br />

DUNCAN Duncan’s multiple comparison procedure based on the Studentized<br />

range test. Used for detecting homogeneity subsets.<br />

SCHEFFE Scheffé’s multiple comparison t test. Used for pairwise comparison<br />

and for detecting homogeneity subsets.<br />

DUNNETT(refcat) Dunnett’s two-tailed t test. Used for pairwise comparison. Each group<br />

is compared to a reference category. You can specify a reference category<br />

in parentheses. The default is the last category. This keyword must<br />

be spelled out in full.<br />

DUNNETTL(refcat) Dunnett’s one-tailed t test. Used for pairwise comparison. This test<br />

indicates whether the mean of each group (except the reference category)<br />

is smaller than that of the reference category. You can specify a<br />

reference category in parentheses. The default is the last category. This<br />

keyword must be spelled out in full.<br />

DUNNETTR(refcat) Dunnett’s one-tailed t test. Used for pairwise comparison. This test<br />

indicates whether the mean of each group (except the reference category)<br />

is larger than that of the reference category. You can specify a<br />

reference category in parentheses. The default is the last category. This<br />

keyword must be spelled out in full.<br />

BONFERRONI Bonferroni t test. This test is based on Student’s t statistic and adjusts<br />

the observed significance level for the fact that multiple comparisons<br />

are made. Used for pairwise comparison.<br />

LSD Least significant difference t test. Equivalent to multiple t tests between<br />

all pairs of groups. Used for pairwise comparison. This test does not<br />

control the overall probability of rejecting the hypotheses that some<br />

pairs of means are different, while in fact they are equal.

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