Basic surveys like that, while helpful, are fairly hard to make such assumptions based off of.
52% of PDs said that they factor in research in deciding who to interview. All that means is that about half of the PDs actually look at research, one way or another. It doesn't mean that they decide to interview you based on whether or not you've done research. Half of them completely ignore that aspect of your application.
My experience is through the lens of an MS4 who's done research and who presented a plan for his research career even in his PS, so I guess you'd have to take it with a grain of salt. That said, even though my psych research is pretty meager (sole author of a couple of meta-analyses that are still in the working paper stage), just having research made me an outlier, and this was interviewing at some of the most competitive programs out there (except for Columbia, MGH, and UCSF, who all hated me apparently).
But here's where I'm coming from: How many people actually go into research? 5% 10% Not many. How many programs heavily emphasize and structure research into their curricula as a requirement? None that I'm aware of. Although a few schools do have a 'research track' and several others readily accomodate residents with research interests.
Residents doing research is not a priority of psychiatry residency program. Training solid clinicians is. So it makes little sense to emphasize research abilities in your search for future residents.
That said, research can be a decent proxy for several desirable traits in a future resident. Research experience (depending on level of involvement) implies that the student has had exposure, learned more about psych than they would have solely through clerkship experience, and a commitment to the specialty. Each of these things can be demonstrated in other ways, though.
Research is kinda like the opposite of a D-Dimer. Positive means that (within reason) you can assume several qualities about a candidate. A negative result doesn't mean a whole lot.