Seems that the premise of the survey may be a tad skewed (particularly for us old, pre-interweb, dinosaurs)
Reminds me of an old story (Old, even for me...)
Bomber Command in WW2 were obviously concerned about the losses they were taking so they decided to take a model Lancaster and each time a bomber returned from a raid the point of any damage would be marked onto the model. In this way a pattern of the most targeted areas would emerge - The idea being that they would then increase the armour plating on the most vulnerable areas.
All went well until some bright spark pointed out that since the survey was based purely on the planes that had made it back - perhaps they should add the armour plating to the bits without the dots...
(Kyriakos - No offence, good luck with your research
)
A