Followed by a B

From: Hugo H Montaldo V. <hmontald_at_FMVZ.UNAM.MX>
Date: Tue, 5 Apr 2005 19:10:48 -0500


I am dealing with a very stubborn group of small datasets for calculating
heritabilities in dairy cattle. Sometimes I got from univariate animal
models variance components followed by a B which means "fixed to a boundary"
¿?. In all these analyses convergence is OK.

¿Should I believe or not these variances? all of them are close to zero. I
have reasons to think they are really not zero from other sub-analyses.

Thank you,


Prof. Hugo H Montaldo V
Departamento de Genética y Bioestadística
Facultad de Medicina Veterinaria y Zootecnia
Universidad Nacional Autónoma de México (UNAM)
Ciudad Universitaria, México 04510, D.F.
Tel./Fax 52 55 5622 5894
Fax. 52 55 5622 5956
Received on Mon Apr 05 2005 - 19:10:48 EST

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