Specific growth rate (SGR) and doubling time are two measures that are used to describe the rate of growth of a population or other quantitative measure.
Specific growth rate (SGR) is a measure of the percentage change in a population or other quantity over a specific period of time. It is calculated as:
SGR = (ln(Nt) – ln(N0)) / t
where Nt is the size of the population at time t, N0 is the size of the population at time 0, and t is the time period over which the growth is being measured.
Doubling time is a measure of the time it takes for a population or other quantity to double in size. It is calculated as:
Doubling time = (ln(2)) / SGR
where SGR is the specific growth rate of the population or other quantity.
Both SGR and doubling time can be used to describe the growth of a population or other quantity over time. SGR is a measure of the percentage change in the population or quantity over a specific period of time, while doubling time is a measure of the time it takes for the population or quantity to double in size.