Statistics

Biostatistics and medical statistics tutorials for physicians and researchers. Learn hypothesis testing, ANOVA, regression analysis, statistical distributions, and inferential statistics for clinical research.

Moments

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A man in early 20th-century clothing stands beside a monumental hourglass in an old hospital room, surrounded by faded medical symbols, a large clock mural, and an iron bed.

The concept of “moment” has various interpretations depending on context, but generally refers to a unit of time, a specific occasion, or a particular state. In mechanics, a “moment” is the tendency of a force to rotate a body around a point or axis. In other contexts, it can refer to a precise instant in … Read more

How many Sums of Squares we’re dealing with in Repeated Measures ANOVA?

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A lecturer in formal early 20th-century dress stands on a small stage addressing a seated audience in a historic hall, rendered as a warm sepia-toned painterly illustration with columns, red drapery, and soft antique light.

When setting up a repeated measures ANOVA test in SPSS, the dialog box for the model has “Type 3 sum of squares” selected by default. By exploring the window further, you’ll find that you can also choose multiple sums of squares: Type 1, Type 2, or Type 4. How many types of Sums of Squares … Read more