Article ID: 46013
Recently, questions have been raised about null hypothesis significant testing, which have been one of the most powerful tools for supporting research evidence in many research fields. This paper focuses on effect sizes, which are required to be reported in order to increase the reliability of such significance tests, and investigates the extent to which effect sizes have been reported in the Japan Journal of Educational Technology over the past 10 years. The results showed that in the Japan Journal of Educational Technology, the ratio of effect size posted in papers increased from around 2016, but it did not increase as much as the ratio in other countries, and it also showed a tendency to fall slightly in recent years. It was also found that the percentage of papers on educational system development that did not include the effect size was particularly high.
