Biostatistics
Sphericity is a statistical assumption in repeated measures analysis that indicates the variances of the differences between all combinations of related groups are equal. This concept is crucial because violations of sphericity can lead to inaccurate conclusions in statistical tests, affecting the validity of the results obtained. Understanding sphericity helps in determining whether adjustments like Greenhouse-Geisser or Huynh-Feldt should be applied when analyzing data from repeated measures designs.
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