The nature of the data can suggest the type of curve.
Index numbers are often valuable in dealing with complicated data or data of great magnitude.
Trend in overseas shipments of Eyepoint Needle Company in millions of needles. Any exponential may be viewed as a logarithmic by inverting the role of dependent and independent variable. An exponential in the traditional view becomes a logarithmic in the alternate view. When a population gets sufficiently large, factors such as food supply and overcrowding tend to hold down the growth. Consumption is proportional to the amount remaining.