S4 collection of GWAS summary statistics keyed by the identity
tuple (study). Each element is that study's per-variant
GRanges covering a single LD block, so build one collection per
block when sweeping the genome.
Details
Required column: study, unique across rows. The class-level
slots inherited from SumStatsBase –
ldSketch, genome and qcInfo – apply uniformly to
every row.
See also
GwasSumStats for the constructor and
QtlSumStats for the QTL counterpart.