Yes:
There is one is particular where he identified that the #1 indicator of whether a new player is still playing in month 4 (after the 3-month on boarding period) is whether they had their ship destroyed or not.
That wasn’t specifically looking at ganking, but ship loss in general.
The most direct statement as to whether their analysis specifically of new player griefing, including through ganking, has a marked impact on new players is this one:
Unfortunately, that has been jumped on (like a lot of the information presented) to suggest ganking helps player retention (CCP have never stated that. Only that they have never found that it has a pronounced/significant/marked negative correlation).
He also went on in the same thread to point out specifically, that this isn’t causal (ie. claiming ganking helps player retention is just as wrong as dismissing CCP’s analysis):
Of course, as I’m sure some will point out, those are older statements (when ganking was occurring at higher levels than it does now), but this isn’t the sum total of what CCP have done. As above, they’ve specifically looked at ganking and it’s impact on the game over several years, because it has such a high focus among the playerbase.
So far, they haven’t found anything that has caused them to nerf ganking any more than they’ve buffed it.