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It is important to consider this at the onset of the study because it will likely have an impact on the number of subjects needed to answer the re- search question with adequate statistical power (16,22 ).
Proper statistical power for the number of subjects needed is a vital calculation in order to recruit enough subjects if attrition is expected in a field study, For example, if the research question can only be answered with complete datasets of individuals that finish the race, more subjects will be needed if it is expected that some individuals may not finish the race.
have statistical power even after attempting to take attrition into account.
Just like other studies, though, large amounts of missing data compromise the integrity of the study by way of influencing variability and statistical power.
Increasing subject size helps maintain statistical power when enough missing data forces the researcher to eliminate a subject from the analysis.
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