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**Synopsis**
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The grmsem package is a quantitative genetics tool supporting the modelling of multivariate genetic variance structures in quantitative data. grmsem allows fitting different models through multivariate genetic-relationship-matrix (GRM) structural equation modelling (SEM) in unrelated individuals, using a maximum likelihood approach. Specifically, it combines genome-wide genotyping information, as captured by GRMs, with twin-research-based SEM techniques. `grmsem` uses a maximum likelihood approach setting fixed effect means to zero by use of **z-standardised** phenotypes.
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The user can select different pre-specified model structures, including
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