Relationship-based pruning with --king-cutoff

[Gabriel Doctor]

hi christopher

Question:

Using --king-cutoff with a threshold, what determines which ID from a pair (or more) gets kept in the "plink.cutoff.in.id". How is one sample of duplicatoin chosen for inclusion over another? 

BW 

Gabriel

ps plink is amazing, so thank you.

[Christopher Chang]

https://github.com/chrchang/plink-ng/blob/master/2.0/plink2_matrix_calc.cc#L288

"As long as edges remain,

a. remove partner of first degree-one vertex, if such a vertex exists

b. otherwise, remove first maximal-degree vertex"

(a) tends to remove later sample IDs, while (b) tends to remove earlier sample IDs.