# omega matrix

**URL:** <https://forum.certara.com/t/omega-matrix/2354>\
**Category:** Modelling and Simulation\
**Created:** [January 23, 2012, 9:21pm UTC](https://forum.certara.com/t/omega-matrix/2354 "2012-01-23T21:21:43Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dora\_teo](https://avatars.discourse-cdn.com/v4/letter/d/7ea924/32.png) [@dora\_teo](https://forum.certara.com/u/dora_teo)\
**Post date:** [January 23, 2012, 9:21pm UTC](https://forum.certara.com/t/omega-matrix/2354/1 "2012-01-23T21:21:43Z")

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Hi, could you tell me if the values displayed in the omega matrix are the actual variances and covariances of the random effects, or are these values displayed as CV% or SDs? Thanks, Dora

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**Author:** ![ecolby](https://avatars.discourse-cdn.com/v4/letter/e/bb73d2/32.png) [@ecolby](https://forum.certara.com/u/ecolby)\
**Post date:** [January 23, 2012, 9:29pm UTC](https://forum.certara.com/t/omega-matrix/2354/2 "2012-01-23T21:29:21Z")

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The diagonal terms in the Omega worksheet in NLME are variances. The off diagonal terms are covariances. Below that, there are a correlation matrix (which contains estimated correlations), and shrinkages.