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How to just use 1000 genomes phase 3 CHB+JPT+CHS data as reference to impute?

I want to just use 1000 genomes phase 3 CHB+JPT+CHS data as reference to impute.

I wonder whether the option in IMPUTE2 program can help me do this.

Or how can I do this?

Thank you.

1000genomes genotype snp impute2

Did you try to run the imputation with standard options? Because impute2 decides on its own which haplotypes to use for imputation. You can play with the k_hap parameter when you get low imputation accuracy.

See this and that overview.

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