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. 2017 Sep 25;12(9):e0184661. doi: 10.1371/journal.pone.0184661

Fig 3. Inter-site variability renders as a batch effect on the calculated IQMs.

Fig 3

These plots display features extracted by MRIQC (columns) of all participants (rows), clustered by site (17 centers from the ABIDE datasets, plus the two centers where DS030 was acquired –“BMC” and “CCN”–). The plot of original features (left panel) shows how they can easily be clustered by the site they belong to. After site-wise normalization including centering and scaling within site (right), the measures are more homogeneous across sites. Features are represented in arbitrary units. For better interpretation, the features-axis (x) has been mirrored between plots.