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Manhattan Plot in R with 100 non-numeric contigs and chromosomes

Hello, I have PLINK assoc file with 67 chromosomes and many contigs ( all of them non-numeric ).

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How can I create a Manhattan Plot?

contigs chromosomes r manhattan non-numeric

Manhattan is just a scatter plot, sort by CHR and BP, then add a row number, then plot. x as rownumber y as -log10(P).

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