2022 Introduction to Statistics in Research Mitchell 2nd ed

I N T R O T O R E S E A R C H : D A T A V I S U A L I Z A T I O N & C O M M O N S T A T T E S T S

Effect Size Calculator with illustrations

Online app located at https://www.psychometrica.de/effect_size.html

There are plenty of online effect size calculators that are available online. The one used and illustrated below can be found at Psychometrica.

Table 120: Effect size - "z" at online calculator

Table 121: Effect size calculation using online calculator

Also, at this website is the transformation of effect sizes, which at first glance appears to muddle the issue. You may be asking yourself – “ Well which of these effect sizes should I use?” And that’s a good question.

Table 122: Online calculator showing all the effect sizes

The U statistic reports the degree to which one group has higher ranks than the other group. This means you have to know your data well. There are many effect size variations to consider that are beyond the basics. These are included in the table below, but clearly labeled “advanced.” For our purposes, let’s concentrate on using “r” for our effect size. Another calculator (and so much more) is located Social Science Statistics at https://www.socscistatistics.com/effectsize/ Don ’ t be afraid to look for calculators that provide a better explanation.

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