Skip to main content
. Author manuscript; available in PMC: 2022 Oct 24.
Published in final edited form as: J Nucl Cardiol. 2022 Jun 7;29(5):2393–2403. doi: 10.1007/s12350-022-03012-6

Figure 1: Internal and External Testing Procedures.

Figure 1:

Summary of the internal and external testing procedures. Internal testing (left) was performed using 10-fold cross-validation where the internal testing population was randomly split into ten folds. In each of 10 iterations, 8 folds are used for training, one-fold for validation and one-fold for testing, with a different fold used for testing in each of 10 iterations. The results from the ten different testing sets are combined to provide an estimate of model performance. In external testing (right), model training and validation is performed with patients from REFINE SPECT and tested in two external sites.