Null Model workflow fits the regression or mixed effects model under the null hypothesis of no genotype effects. i.e., The outcome variable is regressed on the specified fixed effect covariates and random effects. The output of this null model is then used in the association tests.

Quantitative and binary outcomes are both supported. Set parameter family to gaussian, binomial or poisson depending on the outcome type. Fixed effect covariates from the Phenotype file are specified usin

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