How do I convert dbSNP JSON output MAF frequencies to floats?

When you pull the new dbSNP JSON format, the frequencies are given as big integers. For rs222 here are the results from the JSON format inline with their corresponding float versions. How have they encoded the numbers?? What am I missing??

   "type": "frequency",
      "value": "1000Genomes.1:9400188"  
G=0.280551/1405 (1000Genomes)   

      "type": "frequency",
      "value": "ALSPAC.1:5188058"
G=0.209393/807 (ALSPAC)  

      "type": "frequency",
      "value": "Estonian.1:3662341"
G=0.164509/737 (Estonian)  

      "type": "frequency",
      "value": "GnomAD.2:25665167"
G=0.231451/7256 (GnomAD)  

      "type": "frequency",
      "value": "NorthernSweden.1:1958226"
G=0.198333/119 (NorthernSweden)  

      "type": "frequency",
      "value": "TOPMED.2:199575429"
G=0.249251/31298 (TOPMED)  

      "type": "frequency",
      "value": "PAGE_STUDY.1:157947"
G=0.285299/22453 (PAGE_STUDY)  

      "type": "frequency",
      "value": "TWINSUK.1:5188058"
G=0.199838/741 (TWINSUK)  

      "type": "frequency",
      "value": "Vietnamese.1:1125731"
G=0.266355/57 (Vietnamese)

dbsnp json maf

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written 6.5 years ago by domsooch •

1 answer

Figured it out nvrmind!!

"type": "frequency",
      "value": "TOPMED.2:199575429"
G=0.249251/31298 (TOPMED)  

 that number refers to the row_id
{
            "allele_count": 94270,
            "local_row_id": 199575429,
            "observation": {
              "deleted_sequence": "A",
              "inserted_sequence": "A",
              "position": 98531408,
              "seq_id": "NC_000002.12"
            },
            "study_name": "TOPMED",
            "study_version": 2,
            "total_count": 125568
          },

1-94270/125568=0.249251

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written 6.5 years ago by domsooch •