extra variance component

From: Alastair Wilson <Alastair.Wilson_at_ED.AC.UK>
Date: Mon, 18 Sep 2006 18:13:11 +0100

Hello all,

I have just changed to ASReml 2 and am having a small problem with my
animal models - specifically I keep getting an extra "variance" term
reported. I've just run a few simple univariate models and this seems to
only occur if I actually include the variance model. So for example;

y ~ mu !r animal

Gives me Va and a residual variance as expected but,

y ~ mu !r animal

1 1 1

0 0 ID 0.35

ANIMAL 0 ID 0.02

Gives me e.g.

Source Model terms Gamma Component Comp/SE % C
 Variance 5571 5562 1.00000 3.37476 0.00
0 S
 Residual identity 5571 0.111444 0.376097 39.74
0 U
 ANIMAL Ainverse 10044 0.544778E-02 0.183850E-01 2.79
0 U

The problem being the extra, unexpected "variance" component.I checked
the updated part of the manual but couldn't work out what I'm doing
wrong. Has the coding of the variance model changed or am I just
missing something obvious? Any thoughts would be very welcome.


Alastair J Wilson PhD
Postdoctoral Research Fellow
tel. 0131 6507287
Institute of Evolutionary Biology
School of Biological Sciences
The University of Edinburgh
Ashworth Laboratories
The King's Buildings
West Mains Road
Edinburgh EH9 3JT, UK
Received on Sat Sep 18 2006 - 18:13:11 EST

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