I have a list of SNPs from a small GWAS data. But I don't have their strand information. What I have is the chromosome number, posistion, and alleles. I also have their rs numbers.
In order to do imputation, I need the strand information of each of the SNPs, i.e. which strand (+/-) is the recorded SNP coming from. I found a webpage (http://www.well.ox.ac.uk/%7Ewrayner/strand/) that has strand information for some common chips, but unfortunately I don't know what chip they used to get to the results.
I could eventually download the refence genome and write a script to do that. But before that I was wondering if there is any tool already available for this purpose. Thanks!