How can I create a standard linkage format file as an input for Haploview or convert my excel sheet to this format or other acceptable input formats?
Input file formats are elaborated here: https://www.broadinstitute.org/haploview/input-file-formats
My recommendation to you is to get your data converted into PLINK format, from where you can perform many standard analyses, and also convert this further to many other formats (including Haploview).
As you have not explained in detail what data you currently have, there's no specific help that can be offered.
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