How do Class Size and Teacher's Academic Qualifica-tions Affect Students' Academic Performance? An In-ternational Comparative study based on PISA 2018 Results

The study, published in Tsinghua Journal of Education, uses PISA2018 results of 15-year-old middle school students from four provincial administrative regions in China (Beijing, Shanghai, Jiangsu, and Guangdong) , and other OECD countries as analysis sample to explore the differences in the distribution characteristics of class size and teacher academic qualifications between the four regions of China and OECD countries, and the impact of class size, teacher academic qualifications and their interaction terms on student academic performance. Multi-level linearity Model is adopted in the analysis. The results of the study are as follows