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 ________________________________ 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
