相關係數，又称作 關聯係數（英語：correlation coefficient）是一種相關程度的測量，在統計學上的意義是兩個變數之間的關係。關係係數與「皮尔逊积矩相关系数」並不相同。
- ^ correlation coefficient. NCME.org. National Council on Measurement in Education. [April 17, 2014]. （原始内容存档于2017-07-22）.
correlation coefficient: A statistic used to show how the scores from one measure relate to scores on a second measure for the same group of individuals. A high value (approaching +1.00) is a strong direct relationship, values near 0.50 are considered moderate and values below 0.30 are considered to show weak relationship. A low negative value (approaching -1.00) is similarly a strong inverse relationship, and values near 0.00 indicate little, if any, relationship.