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Spearman's Rank Correlation Coefficient

Spearman's rank correlation coefficient shows whether or not two sets of data are related.The relationship between two sets of data is known as correlation.Correlation can be positive or negative or strong or weak or there may be no correlation at all.The two sets of data are ranked from lowest to highest. Where identical values exist the average rank is used.The coefficient is calculated as follows:
The coefficient is then looked up in a table of critical values using the appropriate degrees of freedom or a subjective conclusion can be drawn.

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Specification: OCR Biology A (H020), AS-level, 4.2.2 Classification and evolution. Topic: Classification and Evolution.

Key terms in this lesson

phagocytosis
The process by which a cell, such as a white blood cell, engulfs and digests a pathogen or debris.
pathogen
A microorganism that causes disease.
antigen
A molecule, usually a protein, on the surface of a cell or pathogen that triggers an immune response.
antibody
A Y-shaped protein (immunoglobulin) produced by B plasma cells that binds specifically to a particular antigen.
antigen-presenting cell
A cell, such as a macrophage, that displays a foreign antigen on its surface combined with a major histocompatibility complex molecule, activating T helper cells.

More in Classification and Evolution

All 36 lessons in Classification and Evolution · All OCR AS-level Biology topics