df(redirected from D/F)
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1. a grade or rank within a series, especially a rank awarded to scholars by a college or university.
2. a unit of measure of temperature.
3. a unit of measure of arcs and angles, one degree being 1/360 of a circle.
4. one of the ranks or stages in a progressive series.
d's of freedom (df) the number of ways that the members of a sample can vary independently. For example, if a sample contains n scores and the sum of those scores is known, n − 1 scores are free to vary; the nth score, however, is not free to vary but is determined by the values of the other scores and the established sum of the scores. In this example, the degrees of freedom equal the sample size minus 1 (df = n − 1).
Abbreviation for decayed and filled teeth.Synonym(s): df caries index
Abbreviation for df caries index.