Date:         Thu, 14 Jan 1999 18:19:40 -0000
Reply-To:     Eric Gozi <goze@HPSTAT.CIRAD.FR>
Sender:       "SAS(r) Discussion" <SAS-L@UGA.CC.UGA.EDU>
From:         Eric Gozi <goze@HPSTAT.CIRAD.FR>
Organization: CIRAD
Subject:      Re: mixed models and asymptotic standard errors?

mgonen@my-dejanews.com wrote :
>Try the ASYCOV option in PROC MIXED statement.
>
>Mithat.
 
 
The ASYCOV option of proc mixed statement yields asymptotic covariance
matrix of COVARIANCE parameters. To obtain the asymtotic standard errors of
the fixed effects, an other option is needed : the COVB or XPVIXI option of
the MODEL statement.
 
To obtain the standard errors of either covariance or fixed effects
parameters, you have to calculate the square roots of the diagonal elements
of either matrix. This can be done by saving the matrix content with
additional MAKE 'AsyCov' and make 'XPVIX' statements.
 
Hope this helps,
 
Eric Gozi
CIRAD
(Centre de Coopiration Internationale en Recherche Agronomique pour le
Diveloppement)
Montpellier (France)