Group 1 - The core viewpoint of the article is to track the performance of index-enhanced portfolios and stock selection factors across different indices, highlighting their excess returns and factor effectiveness [1][2][3]. Group 2 - The performance of the CSI 300 index-enhanced portfolio showed an excess return of 0.15% for the week and 0.96% for the year [1][2]. - The performance of the CSI 500 index-enhanced portfolio indicated an excess return of -0.12% for the week and 1.77% for the year [1][2]. - The performance of the CSI 1000 index-enhanced portfolio reflected an excess return of -0.62% for the week and -0.14% for the year [1][2]. Group 3 - In the CSI 300 component stocks, factors such as dividend yield, DELTAROA, and three-month institutional coverage performed well [1]. - In the CSI 500 component stocks, factors like one-year momentum, DELTAROA, and standardized expected excess income showed strong performance [1]. - In the CSI 1000 component stocks, factors including quarterly net profit year-on-year growth, DELTAROA, and quarterly revenue year-on-year growth were effective [1]. Group 4 - The public fund index-enhanced products for the CSI 300 had a maximum excess return of 1.34% and a minimum of -0.63% for the week, with a median of 0.12% [1][17]. - The public fund index-enhanced products for the CSI 500 had a maximum excess return of 0.97% and a minimum of -0.82% for the week, with a median of 0.02% [1][19]. - The public fund index-enhanced products for the CSI 1000 had a maximum excess return of 1.24% and a minimum of -1.00% for the week, with a median of -0.01% [1][21].

Group 1 - The core viewpoint of the article highlights the performance of various index-enhanced portfolios, indicating that the CSI 300 and CSI 500 index-enhanced portfolios achieved positive excess returns, while the CSI 1000 index-enhanced portfolio experienced a slight decline in excess returns this week [1][2][18]. Group 2 - The CSI 300 index-enhanced portfolio recorded an excess return of 0.44% this week and 0.80% year-to-date [1][2]. - The CSI 500 index-enhanced portfolio also achieved an excess return of 0.44% this week and 1.81% year-to-date [1][2]. - The CSI 1000 index-enhanced portfolio saw a decrease of 0.13% in excess return this week, with a year-to-date excess return of 0.50% [1][2]. Group 3 - In the CSI 300 component stocks, factors such as three-month turnover, dividend yield, and one-month turnover performed well [5]. - For the CSI 500 component stocks, factors like executive compensation, expected net profit month-on-month, and dividend yield showed strong performance [6]. - In the CSI 1000 component stocks, factors such as expected PEG, SPTTM, and one-month volatility performed well [10]. Group 4 - The public fund index-enhanced products for the CSI 300 had a maximum excess return of 1.67%, a minimum of -2.70%, and a median of 0.11% this week [18]. - The CSI 500 index-enhanced products had a maximum excess return of 1.55%, a minimum of -0.45%, and a median of 0.38% this week [19]. - The CSI 1000 index-enhanced products recorded a maximum excess return of 1.59%, a minimum of -0.87%, and a median of 0.30% this week [21].