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In statistics, Cook's distance or Cook's D is a commonly used estimate of the influence of a data point when performing a least-squares regression analysis. [1] In a practical ordinary least squares analysis, Cook's distance can be used in several ways: to indicate influential data points that are particularly worth checking for validity; or to indicate regions of the design space where it ...
Ralph Dennis Cook (born June 20, 1944) is an American statistician, mostly known for Cook's distance [1] and the Cook–Weisberg test. [2] Cook is a professor of statistics at the University of Minnesota. After graduating from Northern Montana College (1967), Cook earned his master's (1969) and Ph.D. (1971) degrees from Kansas State University. [3]
In statistics, an influential observation is an observation for a statistical calculation whose deletion from the dataset would noticeably change the result of the calculation. [1] In particular, in regression analysis an influential observation is one whose deletion has a large effect on the parameter estimates.
The formula then divides by () to account for the fact that we remove the observation rather than adjusting its value, reflecting the fact that removal changes the distribution of covariates more when applied to high-leverage observations (i.e. with outlier covariate values). Similar formulas arise when applying general formulas for statistical ...
President Joe Biden on Monday commuted the life sentence of Leonard Peltier, a Native American activist who has been imprisoned for nearly 50 years.. Peltier, a member of the Turtle Mountain Band ...
In statistics, DFFIT and DFFITS ("difference in fit(s)") are diagnostics meant to show how influential a point is in a linear regression, first proposed in 1980. [ 1 ] DFFIT is the change in the predicted value for a point, obtained when that point is left out of the regression:
She was arrested and overthrown in a coup d'etat in the 1900s that ultimately led to Hawaii's statehood after 100 years and a series of turbulent events. Lili'uokalani fought for her people and ...
The clip opens with Chris Kattan, who appeared in the sketch and performed on SNL from 1996 to 2003, discussing Ferrell's exposed belly. "It's hard to be serious when you see that stomach," he ...