Dfbeta Spss. Go to top of page. As shown below we use the save sdbeta sdbf subcommand to save the DFBETA values for each of the predictors.
Popular measures of influence - Cooks distance DFBETAS DFFITS - for regression are presented000 Intro104 Identifying possible individual influential po. A large DFBETA indicates an influential observation. SPSS includes influence statistics that have a long history -- Cooks Distance DfBeta and DfFit.
Im hitting highlights here but the readings include lots of other good.
This chapter has covered a variety of topics in assessing the assumptions of regression using SPSS and the consequences of violating these assumptions. Cooks Distance is a measure of influence for an observation in a linear regression. DFFIT and DFFITS are diagnostics meant to show how influential a point is in a statistical regression first proposed in 1980. Lastly the potential influence of individual observations on the results was assessed by the Cooks D and DFBETA statistics.
