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degrees of freedom |
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degrees of freedom (df), a statistical measure of the number of independent observations or choices among members in a sample. It is used in determining the statistical significance of findings during data analysis. degrees of freedom (df), n.pl a statistic, based on the number of observations and groups in a study, that is necessary to determine statistical significance. One looks up the degrees of freedom and the significance level in a table of significance values to determine if the magnitude of the value obtained is significant. Used with the t-test, chi square, analysis of variance, and correlation. degrees of freedom used to define statistical distributions of several tests, usually based on the number of data items less the number of parameters estimated. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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To test whether the polynomial form is superior to the original form of the variable, a chi-squared test is constructed by using the difference in two models' chi-squared value (or the difference in two times the log likelihood of the two models), with the number of degrees of freedom determined by the number of additional variables added to the polynmnial model. The degrees of freedom with which the arms of the EndoWrist instruments operate include pitch, yaw, and roll plus two additional degrees of freedom in the wrist and two others for tool actuation--a total of seven degrees of freedom in all. 16) Recent studies, (17,18) however, have challenged Bernstein's original hypotheses, suggesting that it is the task that dictates whether the degrees of freedom increase or decrease in the initial stage of skill acquisition. |
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