"A study using a complex mathematical technique claiming to cleanly isolate the effect of X and Y. I can't really follow what it's doing..."
This is a frustrating type of issue. Dismissing something with "I don't understand this, but I don't believe it" isn't the sort of thing I want to be doing. However, I don't have any desire to waste time trying to understand what someone has done (and did they really understand what they were doing themselves?) when it's clear that the effect isn't cleanly isolated in the data and no amount of mathematics is going to change that.
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"A study using a complex mathematical technique claiming to cleanly isolate the effect of X and Y. I can't really follow what it's doing..."
This is a frustrating type of issue. Dismissing something with "I don't understand this, but I don't believe it" isn't the sort of thing I want to be doing. However, I don't have any desire to waste time trying to understand what someone has done (and did they really understand what they were doing themselves?) when it's clear that the effect isn't cleanly isolated in the data and no amount of mathematics is going to change that.