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. 2016 Apr 25;113(19):5218–5220. doi: 10.1073/pnas.1524899113

Fig. 2.

Fig. 2.

Adding observability to a GOTV letter increases impact more than the average impact of a typical GOTV letter. ^From metaanalysis of 79 randomized experiments of typical GOTV letters (29); turnout in the control group was 40.88%; *P < 0.05; Best and Best-plus-Observable bars represent comparison to this experiment’s control group, whereas typical GOTV letter bar represents comparison to control groups included in the metaanalysis.