To test for equality of distribution in SPSS, one can use the “Explore” function under the “Analyze” tab. This will generate descriptive statistics and histograms for the variables of interest. To compare the distributions, one can use the “Compare Means” option under the “Analyze” tab and select the appropriate statistical test, such as the t-test or ANOVA. Additionally, the “Nonparametric Tests” option can be used for non-normally distributed data. It is important to properly select and interpret the appropriate statistical test based on the research question and data characteristics.
How can I test for equality of distribution? | SPSS FAQ
An alternative test to the classic t-test is the Kolmogorov-Smirnov
test for equality of distributional functions. In a simple example, we’ll
see if the distribution of writing test scores across gender are equal using the
hsb2 data set. We’ll
first do histograms of writing scores by gender.
get file = 'c:/hsb2.sav'.
sort cases by female.
split file by female.
GGRAPH
/GRAPHDATASET NAME="iGraphDataset" VARIABLES= write
/GRAPHSPEC SOURCE=INLINE
INLINETEMPLATE=["<addDataLabels><labeling variable='percent'></labeling></addDataLabels>"].
BEGIN GPL
SOURCE: s=userSource( id( "iGraphDataset" ) )
DATA: Y_Var=col( source(s), name( "$count" ) )
DATA:write=col( source(s), name( "write" ) )
GUIDE: axis( dim( 1 ), label( "writing score" ) )
GUIDE: axis( dim( 2 ), label( "Count" ) )
ELEMENT: interval( position( summary.count( bin.rect(write * 1, binCount( 13 ) ) ) ) )
END GPL.
split file off. npar test /k-s = write by female(1 0).
From the test (Kolmogorov-Smirnov Z = 1.738, p = .005), it is apparent that the writing scores do not have
the same distributional function across gender.
Cite this article
stats writer (2024). How can I test for equality of distribution in SPSS?. PSYCHOLOGICAL SCALES. Retrieved from https://scales.arabpsychology.com/stats/how-can-i-test-for-equality-of-distribution-in-spss/
stats writer. "How can I test for equality of distribution in SPSS?." PSYCHOLOGICAL SCALES, 30 Jun. 2024, https://scales.arabpsychology.com/stats/how-can-i-test-for-equality-of-distribution-in-spss/.
stats writer. "How can I test for equality of distribution in SPSS?." PSYCHOLOGICAL SCALES, 2024. https://scales.arabpsychology.com/stats/how-can-i-test-for-equality-of-distribution-in-spss/.
stats writer (2024) 'How can I test for equality of distribution in SPSS?', PSYCHOLOGICAL SCALES. Available at: https://scales.arabpsychology.com/stats/how-can-i-test-for-equality-of-distribution-in-spss/.
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