[epistasis]

I don't see that chart supporting a sudden change. The time point could be moved quite a bit and tell the same story.

Also I had not heard of Kevin Drum before this, and had a positive view of Mother Jones. I'm left with a poor impression of Kevin Drum and a hit to Mother Jones' reputation after reading this.

[dbt00]

You could go read the original paper and examine the actual data and scientific conclusions drawn from the underlying data as represented on that chart.

You could look for confirmation or disconfirmation of the hypothesis that preregistration leads to an increase in null results in other data sets.

Both of those seem like more useful ways to dispute this finding than squinting at a graph and finding fault with a blog post headline.

[epistasis]

I'm not sure if you meant to reply to me, because every aspect of your post is wrong.

The "squinting at the graph" was assuming that there's a sudden change. I read the paper, and looked up several studies and came to the conclusion that the paper was being misrepresented by the blog text. And I agreed with the headline, but not with the blog text.