1. oc::UN
    United Nations Vote Data
    csv| xlsx| json| ndjson| rda| rds
    data.frame|59 x 239
  2. oc::sen90
    90th U.S. Senate Roll Call Vote Matrix
    rda| rds
    rollcall
  3. oc::sen90oc
    90th U.S. Senate Ideal Points via Optimal Classification
    rda| rds
    OCobject