Dear community,

given the following deletion I have two questions

11    108196712    .    CATT    C    228    .
INDEL;IDV=921;IMF=0.985027;DP=934;VDB=0;SGB=-0.693147;MQSB=0.970784;MQ0F=0;AC=2;AN=2;DP4=0,0,537,397;MQ=59
 

GT:PL    1/1:255,255,0

As IDV (=Maximum number of reads supporting an indel) states there are 
921 reads supporting the indel but the DP4 value says there are 
934(=537+397) reads with the alt allele (the deletion).

1) How is this often seen (and often more extreme) difference explained?

2) Why is IMF (=Maximum fraction of reads supporting an indel) not 
exactly 921/934=0.9860814 but 0.985027?


Thanks very much,
Christian

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