Dear all,
I am still confused how to determine the % of explained variability by
including covariates from Omega . Omega estimate were 0.175 (before) and 0.164
(after). Objective function value decreased more than 150 units and the
goodness-of-fit plots confirmed the positive impact of this covariate.
How these values should be treated?
Any feedback? thanks in advance
Khaled
Omega ratio
Dear Khaled,
You could for example report this as "Including covariate X in the
model, the estimate of random (unexplained) between-subject variability
in parameter Y reduced from 41.8 %CV to 40.5 %CV".
Reporting % explained variability may lead to confusion on if this is in
percent or percental units or if it is on the CV scale or variance
(OMEGA) scale (3 different values that you can present), so I think the
above is easier to understand. If you prefer you can report it as r or
R^2, but the values are generally not very impressive.
Best
Jakob
Quoted reply history
________________________________
From: [email protected] [mailto:[email protected]]
On Behalf Of Khaled Nm
Sent: 15 July 2009 12:07
To: [email protected]
Subject: [NMusers] Omega ratio
Dear all,
I am still confused how to determine the % of explained variability by
including covariates from Omega . Omega estimate were 0.175 (before) and
0.164 (after). Objective function value decreased more than 150 units
and the goodness-of-fit plots confirmed the positive impact of this
covariate.
How these values should be treated?
Any feedback? thanks in advance
Khaled