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The refined version of the PSS will be prospectively validated in a validation sample (n=1500).
The automated model was then validated in the remaining 50% from the total cohort (validation sample).
Limitations: No validation sample for derived formula.
Four models for the validation sample are considered.
The validation sample included 127 mental health outpatients.
Local PLSR uses only calibration samples that are spectral neighbors of each validation sample, thus builds one model per validation sample.
Validation sample points were not used for the training of the classifier.
Fig. 1 Measurement model with 17 items and four factors, confirmed in the validation sample.
In such situations, a validation sample with precise measurements of the variables is not available.
Under Model 1, the validation sample is a simple random sample with probability π i =0.4.
In many circumstances, a validation sample is impossible to be collected for various reasons.
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