27.03.2013 Views

SPSS® 12.0 Command Syntax Reference

SPSS® 12.0 Command Syntax Reference

SPSS® 12.0 Command Syntax Reference

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

524 EXAMINE<br />

HISTOGRAM Histogram.<br />

SPREADLEVEL(n) Spread-versus-level plot with the Test of Homogeneity of Variance<br />

table. If the keyword appears alone, the natural logs of the interquartile<br />

ranges are plotted against the natural logs of the medians for all<br />

cells. If a power for transforming the data (n) is given, the IQR and<br />

median of the transformed data are plotted. If 0 is specified for n, a natural<br />

log transformation of the data is done. The slope of the regression<br />

line and Levene tests for homogeneity of variance are also displayed.<br />

The Levene tests are based on the original data if no transformation is<br />

specified and on the transformed data if a transformation is requested.<br />

NPPLOT Normal and detrended Q-Q plots with the Tests of Normality table<br />

presenting Shapiro-Wilk’s statistic and a Kolmogorov-Smirnov statistic<br />

with a Lilliefors significance level for testing normality. If non-integer<br />

weights are specified, the Shapiro-Wilk’s statistic is calculated<br />

when the weighted sample size lies between 3 and 50. For no weights<br />

or integer weights, the statistic is calculated when the weighted sample<br />

size lies between 3 and 5000.<br />

ALL All available plots.<br />

NONE No plots.<br />

Example<br />

EXAMINE VARIABLES=CYCLE BY TREATMNT /PLOT=NPPLOT.<br />

• PLOT produces normal and detrended Q-Q plots for each value of TREATMNT and a Tests<br />

of Normality table.<br />

Example<br />

EXAMINE VARIABLES=CYCLE BY TREATMNT /PLOT=SPREADLEVEL(.5).<br />

• PLOT produces a spread-versus-level plot of the medians and interquartile ranges of the<br />

square root of CYCLE. Each point on the plot represents one of the TREATMNT groups.<br />

• A Test of Homogeneity of Variance table displays Levene statistics.<br />

Example<br />

EXAMINE VARIABLES=CYCLE BY TREATMNT /PLOT=SPREADLEVEL(0).<br />

• PLOT generates a spread-versus-level plot of the medians and interquartile ranges of the<br />

natural logs of CYCLE for each TREATMENT group.<br />

• A Test of Homogeneity of Variance table displays Levene statistics.<br />

Example<br />

EXAMINE VARIABLES=CYCLE BY TREATMNT /PLOT=SPREADLEVEL.<br />

• PLOT generates a spread-versus-level plot of the natural logs of the medians and interquartile<br />

ranges of CYCLE for each TREATMNT group.<br />

• A Test of Homogeneity of Variance table displays Levene statistics.

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!