To the contrary, johnswentworth’s point is not that the experiments have low external validity but that they have low internal validity. It’s that there are confounds.
Ironically, one of my quibbles with the post is that the verbiage implies measurement error is the problem. Not measuring what you think you’re measuring is about content validity, but the post is actually about how omitted variables (i.e., confounders) are a problem for inferences. “You are not Complaining About What You Think You Are Complaining About.”
To the contrary, johnswentworth’s point is not that the experiments have low external validity but that they have low internal validity. It’s that there are confounds.
Ironically, one of my quibbles with the post is that the verbiage implies measurement error is the problem. Not measuring what you think you’re measuring is about content validity, but the post is actually about how omitted variables (i.e., confounders) are a problem for inferences. “You are not Complaining About What You Think You Are Complaining About.”