https://commons.m.wikimedia.org/wiki/File:P-hacking_by_early_stopping.svg https://commons.m.wikimedia.org/wiki/File:P-hacking_by_early... The author is absolut

https://commons.m.wikimedia.org/wiki/File:P-hacking_by_early_stopping.svg https://commons.m.wikimedia.org/wiki/File:P-hacking_by_early... The author is absolutely correct. Early stopping is a classic form of p hacking. See attached image for an illustration. If you want to be rigorous, you can define criterion for early stopping such that it's not, but you require relatively stronger evidence. Clinical trials that stop early do so typically at predefined times with higher significance thresholds.