How to calculate the effect size for Chi Square goodness of fit test in SPSS

After conducting the chi-square goodness-of-fit test in SPSS the difference between the observed and expected distributions (or rather effect) should be quantified. Effect sizes are used for this purpose. For the chi-square goodness-of-fit test, Cohen's ω (sometimes just: w).
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Be aware that the classification is reasearch field specific. The classification is subject-specific. For the social and behavioral sciences, the paper Cohen, J. (1992), A Power Primer, p. 157 is usually cited:
📚 Cohen, J. (1992): Quantitative methods in psychology: A power primer. Psychological bulletin, pp. 155-159.
⏰ Timestamps:
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0:00 Introduction
0:09 Calculation of Cohen's ω
0:59 Classification of Cohen's ω
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