Table A4. Predictive performance by...

Table A4.

Predictive performance by temporal period under balanced sampling

Train year	Test year	AUC	Precision	Recall	F1-Score
2018	2019	0.972	0.899	0.625	0.716
2019	2020	0.968	0.933	0.622	0.723
2020	2021	0.957	0.896	0.531	0.640
2021	2022	0.960	0.919	0.502	0.636

Note(s):

Values represent averages across 12 CPV categories for each temporal period. The narrow range in AUC (0.957–0.972) and precision (0.896–0.933) demonstrates temporal stability of structural prediction patterns, while modest variation in recall reflects either changing procurement dynamics or increased relationship complexity in later years

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