Three-Layer Framework for Service Industry Quality Assessment: Evidence from Shiyan City

This study proposes a three-tier framework integrating VAE deep generative modeling, multi-method time series forecasting, and macro-environmental validation for service industry quality assessment in medium-sized cities. Applied to Shiyan City's 19 service industries, the framework achieved 0.7727 average quality scores and identified 14 positive-growth industries with 66.7% high-confidence predictions, providing systematic solutions for regional service industry development evaluation.