Since the beginning of the COVID-19 pandemic, more than 130 biotech companies have launched major efforts to develop and test vaccines. Only four have been approved so far (Pfizer, Moderna, Johnson & Johnson, and AstraZeneca). Among the others, many have outright failed, and others are considered highly unlikely. Some of the failed vaccines are small, … Continue reading Lessons for Educational Research from the COVID-19 Vaccines→| Robert Slavin's Blog
Whenever I talk to educators and mention effect sizes, someone inevitably complains. “We don’t understand effect sizes,” they say. I always explain that you don’t have to understand exactly what effect sizes are, but if you do know that more of them are good and less of them are bad, assuming that the research from … Continue reading Another Way to Understand Effect Sizes→| Robert Slavin's Blog