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. Author manuscript; available in PMC: 2021 Mar 1.
Published in final edited form as: Biol Psychiatry. 2019 Sep 18;87(5):473–482. doi: 10.1016/j.biopsych.2019.09.005

Figure 2. HYDRA identifies 2 subtypes of internalizing youth with a high level of stability.

Figure 2.

Cross-validated adjusted Rand index (ARI) for 2-10 cluster solutions obtained with HYDRA. The ARI was computed with 10-fold cross-validation to quantify the similarity between different clustering results while controlling for grouping by chance, resulting in a more conservative estimation of the overlap between clustering solutions. The figure shows a clear peak at the 2-cluster solution (shown with a dotted line), suggesting our data has 2 subtypes of internalizing youth which show a high degree of stability (ARI = .66).