Question: How to calculate LD values of SNP based on chromosomal positions and their call rate?
gravatar for blacktomato27
16 months ago by
United States
blacktomato2740 wrote:

Hi to all Good Afternoon

I have file containing SNPs (affy 44k chip) with their call rate and chromosomal positions with me and these belongs to rice crop. Now how can i calculate LD values (r2) for these SNPs, my basic objective is to select tag SNPs based on LD for genotyping work. any help with any R packages or own functions in this regard will be highly appreciated Thanks in Advance


snp R • 661 views
ADD COMMENTlink written 16 months ago by blacktomato2740

To calculate LD you need a set comprising many genotypes (similar hapmap or 1kG, see also 1000 Genomes Ld Calculation ) from possibly many populations, do you have that? A quick google search did not reveal a genome wide public resource like that, but some older papers studying a selection of genotypes.

ADD REPLYlink modified 16 months ago • written 16 months ago by Michael Dondrup45k

You can try to convert the data to PLINK format and then run a LD analysis there. Affymetrix PowerTools has a function that converts genotype data to PLINK format:

ADD REPLYlink written 15 months ago by Kevin Blighe37k
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