Dffits And Dfbetas In R. Which I think may be one of the references in the R documentation under the package stats. 2sqrt frac k2 n-k-22sqrt frac 11 21-1-2082.
Which I think may be one of the references in the R documentation under the package stats. One way to calculate the influence of observations is by using a metric known as DFFITS which stands for difference in fits. Therefore based on this guideline we would consider the red data point influential.
In general large values of DFBETAS indicate observations that are influential in estimating a given parameter.
DFFITS is the Studentized DFFIT where. A one-sided formula that specifies a subset of the terms in the model. There is a DFBETA for each data point ie if there are n observations and k variables there will be n k DFBETAs. Last updated almost 5 years ago.
