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Effect Size Calculation Help for
Dissertation Students & Researchers
What is an Effect Size
Effect size (ES) is a name given to
a family of indices that measure the magnitude of a treatment effect. An effect
size is the size of the relationship between two variables and is usually
defined as the difference in mean outcomes between the treatment and control
group. Effect size is also an indicator of the strength of the difference
between two groups. You should specify the effect size you require before
collecting or analyzing your data. Several factors influence what effect size
one will choose. These factors include theory, standard practice in your
particular field, previous or similar research studies, cost, resources and
feasibility. There are formulas that can be used to calculate effect size, and
some are more complicated than others.
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Why is Calculating Effect Size Important
Effect sizes are generally defined
as small (d = .2),
medium (d = .5), and large (d = .8). In general you need to know
the effect size you hope to achieve to calculate statistical power. Knowing the
effect size you hope to achieve will save you valuable time and resources.
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More About Effect Size
Let Us Help You Calculate Your Effect Size
Given the importance of measuring
effect size, it is important that it is conducted properly and explained in
simple language. In addition, if you are unsure about how to measure effect
size, let us help you calculate your effect size and explain the various
components to you. If you are unsure what statistical test might be the most
appropriate and powerful for your study, let us review your research question to
help you choose the best statistical test for your study.
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