The formula for exponential growth is V = S x (1+R) T, where S is the starting value, R is the interest rate, T is the number of periods that have elapsed, and V is the current value.

Nonlinear regression uses logarithmic functions, trigonometric functions, exponential functions, power functions, Lorenz curves, ... depending on the form of the linear regression equation.

Crane, D. B., and James R. Crotty. "A Two-Stage Forecasting Model: Exponential Smoothing and Multiple Regression." Management Science 13, no. 8 (April 1966 ...