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GEMMA is a software toolkit for fast application of linear mixed models (LMMs) |
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GEMMA is a software toolkit for fast application of linear mixed models (LMMs) |
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and related models to genome-wide association studies (GWAS) and other |
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and related models to genome-wide association studies (GWAS) and other |
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large-scale data sets. |
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large-scale data sets. |
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Key features: |
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1. Fast assocation tests implemented using the univariate linear mixed model |
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(LMM). In GWAS, this can correct for population structure and sample |
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non-exchangeability. It also provides estimates of the proportion of |
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variance in phenotypes explained by available genotypes (PVE), often called |
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"chip heritability" or "SNP heritability". |
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2. Fast association tests for multiple phenotypes implemented using a |
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multivariate linear mixed model (mvLMM). In GWAS, this can correct for |
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population structure and sample (non)exchangeability - jointly in multiple |
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complex phenotypes. |
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3. Bayesian sparse linear mixed model (BSLMM) for estimating PVE, phenotype |
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prediction, and multi-marker modeling in GWAS. |
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4. Estimation of variance components ("chip/SNP heritability") partitioned by |
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different SNP functional categories from raw (individual-level) data or |
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summary data. For raw data, HE regression or the REML AI algorithm can be |
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used to estimate variance components when individual-level data are |
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available. For summary data, GEMMA uses the MQS algorithm to estimate |
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variance components. |