Originally Posted by
Oberon
It's not even debatable whether the DPA survey is biased. It is clearly biased and unless the authors have no familiarity with statistics they would say so themselves. Only Delta pilots who go to the DPA website participate and since not all Delta Pilots go to the DPA website it isn't representative of the pilot group. You can argue how exactly that bias affects results but you can't argue the DPA survey isn't biased...unless you have no familiarity with statistics.
For what it's worth the ALPA survey suffers from a similar bias.
I agree with you. As a matter of fact, the more I think about it, the less valid I believe any of these surveys to be. They are a tool, yes, but to put much value in them as a representation of the group is questionable, and might even be harmful in a sense. I did ask my rep if a poll would be done and he said that it would. All the doughnuts need to get their names on the top of that list so they can skew the true metrics.
