. 2016 Dec 13;11(12):e0166902. doi: 10.1371/journal.pone.0166902

Table 1. Summary of the stepwise filtering protocol applied to the hybridized microarrays.

Quality control step	Feature	Discarded features (%)
Quality control step	Feature	Training set	Test set
1: Spot filter	Individual spots	0.20	4.05 (PR spots); 1.27 (RT spots)
2: Probe filter 1	Probes overlapping >25% ^*	9.09	9.09
3: Probe filter 2	Duplicated probes ^*	10.13	10.13
4: Array filter	Full microarrays	4.46	4.16 (PR region); 0 (RT region)

* The discarded probes in the training set were not used in the test set, while no extra probes were discarded in the test set. As a result, the % of discarded probes is equal in both sets.