"Dave Stadt" wrote
One might say that the fatal accident rate seems disproportionate
(50% of the SR20, 25% for the SR22 versus 10% for the 172 and 20% for
the 182), but at the sample sizes present, there's absolutely no
reasonable way to draw any valid statistical conclusion (and note
that for the SR22 and the 182, the rates are actually similar).

Apples and oranges. The 182 fleet is many times larger than the SR22
fleet. And the 172 fleet is near infinite compared to the Cirrus
fleet. The numbers look pretty bad for Cirrus.

Did you adjust for the kind of flying done by each? No, you didn't.

The flights all involve an equal number of takeoffs and landings only
some are more successfull in the landing department than others.

Unless you wish to redefine "flight" , no, they don't. Are circuits
"flights"?

I suspect so. Unless one just motors around on the ground in a big
rectangle.

Which would be redefining "circuits". So the flights don't "all involve an
equal number of takeoffs and landings". Your desire to engage in semantics
aside, Cirruses are not training aircraft. So a direct comparison of
"numbers" is really telling us enough about the safety of each plane.
Either way.

moo