R help - Jun 2010 - NeweyWest

I want to calculate Newey West robust standard error using NeweyWest. Comparing
the results to what I get in STATA, in order to get the same results in I need
to specify "prewhite=0". Can someone explain what this prewhite
command means?



Thanks 


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On Sun, 27 Jun 2010, Jurica Brajkovi? wrote:
> I want to calculate Newey West robust standard error using NeweyWest. 
> Comparing the results to what I get in STATA, in order to get the same 
> results in I need to specify "prewhite=0". Can someone explain
what this
> prewhite command means?
It controls whether autocorrelation in the estimating functions should be 
removed/reduced by using a VAR model.

?NeweyWest says:

prewhite: logical or integer. Should the estimating functions be
           prewhitened? If 'TRUE' or greater than 0 a VAR model of order
           'as.integer(prewhite)' is fitted via 'ar' with method
'"ols"'
           and 'demean = FALSE'. The default is to use VAR(1)
           prewhitening.

The "Details" section adds:  To obtain the estimator described in
Newey &
West (1987), prewhitening has to be suppressed.

References can also be found on the manual page as well as in Section 3.2
of vignette("sandwich", package = "sandwich").
Z
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> Thanks
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