Hello, 

have variables that used differing likert scales. 

study calls for one way ANOVA

tried doing a check for outliers with box plot, but has outliers. 

data is sound since responses were imported and were likert scale number values. 

SPSS guide says can't use one way ANOVA if outliers exist. 

is anyone available to screen share in Teams to point me in the right direction? If so please reply and I can send an invite? Thank you 

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Patrice Chandler
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#SPSSStatistics

This is a direct copy from a webpage but sums up exactly what your options are.

Dealing with outliers

Once a potential outlier has been identified, first check the data to make sure the outlier is not a data entry or data coding error. If not you can conduct a sensitivity analysis as follows to see how much the outlying observations affect your results.

• Run ANOVA on the entire data.
• Remove outlier(s) and rerun the ANOVA.
• If the results are the same then you can report the analysis on the full data and report that the outliers did not influence the results.
• If the results are different, try running a non-parametric test (e.g. Kruskal-Wallis) or simply report your analysis with and without the outlier.

Two other approaches for dealing with outliers are to use trimmed means or Winsorized samples (as described in Outliers and Robustness) or to use a transformation. In particular, a reciprocal transformation f(x) = 1/x can be useful.

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Kate Clark
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