Greetings,
 
On page 273, Cohen, Cohen, West, and Aiken (Applied Multiple Regression/Correlation Analysis for the Behavioral Sciences, Third Edition", state that the covariance matrix of the regression coefficients is provided by standard programs for multiple regression, including SAS, SPSS, and SYSTAT. How does one calculate the matrix in R. Thank you very much.
 
pbmPeter B. Mandeville cel:      444 860 3204 tel:  52 444 826 2346-49 ext 532 fax: 52 444 826 2352 P.D. Favor de confirmar la llegada de este correo. Gracias.
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