Re: [R] influence.measures(stats): hatvalues(model, ...)

2009-11-08 Thread Viechtbauer Wolfgang (STAT)
oject.org [r-help-boun...@r-project.org] On Behalf Of Sigmund Freud [ss_freud...@yahoo.com] Sent: Sunday, November 08, 2009 8:14 AM To: r-help@r-project.org Subject: [R] influence.measures(stats): hatvalues(model, ...) Hello: I am trying to understand the method 'hatvalues(...)', w

Re: [R] influence.measures(stats): hatvalues(model, ...)

2009-11-08 Thread Peter Ehlers
Sigmund Freud wrote: Hello: I am trying to understand the method 'hatvalues(...)', which returns something similar to the diagonals of the plain vanilla hat matrix [X(X'X)^(-1)X'], but not quite. A Fortran programmer I am not, but tracing through the code it looks like perhaps some sort of co

[R] influence.measures(stats): hatvalues(model, ...)

2009-11-07 Thread Sigmund Freud
Hello: I am trying to understand the method 'hatvalues(...)', which returns something similar to the diagonals of the plain vanilla hat matrix [X(X'X)^(-1)X'], but not quite.  A Fortran programmer I am not, but tracing through the code it looks like perhaps some sort of correction based on the