growth_linear: Linear growth

In popstudy: Applied Techniques to Demographic and Time Series Analysis

Linear growth

Description

Assuming an linear behavior, estimates the population size at time t, the growth rate, or population at time 0.

Usage

growth_linear(
  Nt = NULL,
  N0 = NULL,
  r = NULL,
  t0,
  t,
  time_interval,
  date = FALSE
)

Arguments

Nt	numeric. The population at time t. If null and date = FALSE, then estimate the population at time t.
N0	numeric. The population at time 0. If null and date = FALSE, then estimate the population at time 0.
r	numeric. The growth rate. If null and date = FALSE, then estimate the growth rate for the time period [t0,t].
t0	numeric. An object of class character with the date for the first population.
t	numeric. An object of class character with the date for the second population.
time_interval	character. A string with the time interval to calculate Delta_t.
date	logical. If TRUE, then estimates the moment t when Nt reaches a specific value.

Value

growth_linear returns a data frame with N0, Ntr, t0, t, delta, and time_interval for desire parameters.

Author(s)

Cesar Gamboa-Sanabria

References

\insertRef

growth_exppopstudy

See Also

growth_exp,growth_logistic

Examples

# According to the Panama census at 2000-05-14,
# the population was 2,839,177. In 2010-05-16, the census
# calculates 3,405,813 population.
# To get r:

growth_linear(N0=2839177, Nt=3405813, t0="2000-05-14", t="2010-05-16", time_interval = "years")

# To get Nt at 2000-06-30:

growth_linear(N0=2839177, r=0.0182, t0="2000-05-14", t="2000-06-30", time_interval = "years")

# The time when the population will be 5,000,000.

growth_linear(N0=2839177, Nt=5000000, r=0.0182, t0="2000-05-14", date=TRUE)

popstudy documentation built on Oct. 18, 2023, 1:20 a.m.