Degree of freedom: Difference between revisions
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'''Note:''' This concept refers to the number of independent contributions to a sampling distribution (such as chi-square distribution). In a [[contingency table]], it is the number of cells that can be filled freely, without changing the totals. In a table with i lines and j columns, ddl = (i – 1)*(j - 1) (for example, in a 2 x 2 table comparing two groups for a dichotomous outcome, such as death, the chi-square distribution associated with it has one degree of freedom). | '''Note:''' This concept refers to the number of independent contributions to a sampling distribution (such as chi-square distribution). In a [[contingency table]], it is the number of cells that can be filled freely, without changing the totals. In a table with i lines and j columns, ddl = (i – 1)*(j - 1) (for example, in a 2 x 2 table comparing two groups for a dichotomous outcome, such as death, the chi-square distribution associated with it has one degree of freedom). | ||
== Reference == | |||
http://htaglossary.net/degree-of-freedom | |||
Latest revision as of 14:00, 21 November 2023
The number of independent comparisons that can be made between the members of a sample of patients.
Note: This concept refers to the number of independent contributions to a sampling distribution (such as chi-square distribution). In a contingency table, it is the number of cells that can be filled freely, without changing the totals. In a table with i lines and j columns, ddl = (i – 1)*(j - 1) (for example, in a 2 x 2 table comparing two groups for a dichotomous outcome, such as death, the chi-square distribution associated with it has one degree of freedom).