The local Distance Difference Test (lDDT) is a superposition-free score which evaluates local distance differences in a model compared to a reference structure. Please provide model and reference structures (using identical numbering of the amino acid sequence):
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If you use local distance difference test (lDDT), please cite the following reference:
  • Mariani V., Biasini M., Barbato A., and Schwede T. (2013). lDDT: A local superposition-free score for comparing protein structures and models using distance difference tests. Bioinformatics. Bioinformatics 29 (21), 2722-2728. [PDF]