congress number
roll call number
H=House, S=Senate
total yeas
total nays
day of month
total correctly classified
Predicted Yea/Actual Yea
Predicted Yea/Actual Nay
Predicted Nay/Actual Yea
Predicted Nay/Actual Nay
proportion correctly classified
proportional reduction in error
geometric mean probability
spread on 1st dimension
midpoint on 1st dimension
spread on 2nd dimension
midpoint on 2nd dimension