Group 1 - The core viewpoint of the article is to track and analyze the performance of various index enhancement portfolios and the factors influencing stock selection across different indices [1][2][5][18]. Group 2 - The performance of the CSI 300 index enhancement portfolio this week showed an excess return of 0.00%, with a year-to-date excess return of 3.00% [6][22]. - The CSI 500 index enhancement portfolio had an excess return of 0.01% this week, but a year-to-date excess return of -0.88% [6][24]. - The CSI 1000 index enhancement portfolio achieved an excess return of 0.90% this week, with a year-to-date excess return of 2.17% [6][25]. - The CSI A500 index enhancement portfolio reported an excess return of -0.53% this week, with a year-to-date excess return of 2.90% [6][28]. Group 3 - In the CSI 300 component stocks, factors such as expected PEG, quarterly ROA, and EPTTM performed well [7][9]. - In the CSI 500 component stocks, factors like dividend yield, EPTTM, and BP showed strong performance [11][10]. - For the CSI 1000 component stocks, factors including quarterly ROA, quarterly ROE, and standardized expected non-operating income performed well [13][12]. - In the CSI A500 index component stocks, factors such as dividend yield, quarterly revenue growth year-on-year, and quarterly ROA were notable [15][14]. Group 4 - The public fund index enhancement products for the CSI 300 had a maximum excess return of 1.08% and a minimum of -1.05% this week, with a median of -0.02% [22][20]. - The CSI 500 index enhancement products had a maximum excess return of 1.72% and a minimum of -0.67% this week, with a median of 0.29% [24][23]. - The CSI 1000 index enhancement products reported a maximum excess return of 0.96% and a minimum of -0.97% this week, with a median of 0.18% [26][25]. - The CSI A500 index enhancement products had a maximum excess return of 1.14% and a minimum of -1.73% this week, with a median of -0.00% [28][27].