While the development of the subject of catalysis may not be linear with time, involving, on occasion, massive step changes, in my view the best way to project to what will happen in the next eight years is to extrapolate what has happened over the past eight years.
Subjects ranged in age from one to 88 years, making it possible to extrapolate data for older subjects.
Unfortunately, due to the low mean age of patients enrolled (46 years), it is difficult to extrapolate this data to elderly patients.
We hypothesized that ground truth data from one year could be used to extrapolate previous or future landuse in a complex landscape where cropping systems do not generally change greatly from year to year because the majority of crops are established perennials or the same annual crops grown on the same fields over multiple years.
This method is arguably the best possible approach in the absence of a control group, 27 but it is sensitive to assumptions and we decided not to use it for the indicators removed in April 2006 as we would have had to extrapolate many years into the future.
The aim of much SF, as Ursula Le Guin put it in her review of The Year of the Flood, "is to extrapolate imaginatively from current trends and events to a near-future that's half-prediction, half satire".
It was difficult to find historical data for these two parameters that would allow the construction of a trend to extrapolate into future years.
To extrapolate, after 15 years, an amount of ZAR33.313.68 (USD $2325) can be saved, using as a template the cost of cooking by electricity.
That matters, because it gives us foundation to extrapolate to full-year revenue figures.
We extrapolate selection at one site in two years to an entire drainage, extrapolate selective mortality beyond the bounds of our empirical data, and assume hard selection wherein frequency and density-dependent effects are not factored.
