This method of proof can assume several slightly different forms.

This method assumes that the study population is "closed".

All other methods assume cases to be sampled and variables fixed.

The method does not assume aconstant rate of change.

This method assumes both constant incidence and survival rates for the period of the population projections.

This method assumes, of course, that there is no change in either incidence or survival rates.

This method assumes, in most cases, each edge has the same probability.

Again, this method assumes that the top of the tree is vertically over the base.

The method assumes a turnout of approximately 50 percent tomorrow.

The methods of calculation which follow assume that any hub gear is in direct drive.