It's a widespread problem in science: https://www.nature.com/news/1-500-scientists-lift-the-lid-on-reproducibility-1.19970 https://www.nature.com/news/1-500-sc

It's a widespread problem in science: https://www.nature.com/news/1-500-scientists-lift-the-lid-on-reproducibility-1.19970 https://www.nature.com/news/1-500-scientists-lift-the-lid-on... A domain where results are easily reproducible is settled science, and not what people are researching anymore. Every field moves on till they get stuck on problem areas that hinder progress. Kind of a Peter principle for research. And what's worse, bad studies act as a hindrance since they make an unsolved question look like settled science, and you can't get support for pursuing a competing hypothesis. And epidemiology seems really complex to me. Every person is unique in many ways and behaving based on effects stretching back over their entire lives.