Overview SPSS Nonparametric Tests
SPSS nonparametric tests are mostly used when assumptions aren't met for other tests such as ANOVA or t tests.Strictly, most “nonparametric tests” in SPSS are distribution free tests. Oddly, these two concepts are entirely different but often used interchangeably. Second, nonparametric tests are suitable for ordinal variables too. In rare cases they may have more statistical power than standard tests.
Not sure which (nonparametric) test to use? You'll quickly find the answer in Simple Overview Statistical Comparison Tests.
SPSS binomial test is used for testing whether a proportion from a single dichotomous variable is equal to a presumed population value. Read More
SPSS sign test for one median the right way. Recode your outcome variable into values higher and lower than the hypothesized median and test if they're distribted 50/50 with a binomial test. Read More
2 Independent Samples
The Mann-Whitney test is an alternative for the independent samples t test when the assumptions required by the latter aren't met by the data. The most common scenario is testing a non normally distributed outcome variable in a small sample (say, n < 25). Read More
SPSS median test evaluates if two groups of respondents have equal population medians on some variable. This easy tutorial quickly walks you through. Read More
3(+) Independent Samples
SPSS Kruskal-Wallis test is a nonparametric alternative for a one-way ANOVA. This tutorial shows how to run it and when to use it. Read More
2 Related Samples
SPSS Wilcoxon Signed-Ranks test is used for comparing two metric variables measured on one group of cases. It's the nonparametric alternative for a paired-samples t-test when its assumptions aren't met. Read More
SPSS sign test for two related medians tests if two variables measured in one group of people have equal population medians. Read More
3(+) Related Samples
SPSS Cochran's Q test is a procedure for testing whether the proportions of 3 or more dichotomous variables are equal. These outcome variables have been measured on the same people or other statistical units. Read More
SPSS Friedman test compares the means of 3 or more variables measured on the same respondents. Like so, it is a nonparametric alternative for a repeated-measures ANOVA that's used when the latter’s assumptions aren't met. Read More