Another stray observation from SP4 Best Novel data partly inspired by an odd claim at Mad Genius that ‘weak correlations’ in Hugo2015 nomination data was evidence of secret-slate/cabals/whatever (um, nope it is what you’d expect).
I looked at which books had nominators in common and how many nominators in common they had. I then tabulated those books with more than 2 in common and drew a pretty picture.
I also included a couple of lonesome but popular nominees: Seveneves and Honor at Stake.
There are two distinct families. The more popular one is centered around Jim Butcher’s Aeronauts Windlass and the less popular one around Uprooted/The Fifth Season/Ancillary Mercy. The Sp4 data is has probably fewer connections between books as many people nominating just nominate a single book unlike a Hugo ballot were nominating 5 is encouraged.