growth_logistic function

Logistic growth

Given two pivots and limits, estimates the growth assuming a logistic behavior.

growth_logistic(pivot_values, pivot_years, upper, lower, t)

Arguments

• pivot_values: numeric. Reference values to estimate, like TFR for two specific years.
• pivot_years: numeric. Reference years to estimate for both values in pivot_values.
• upper: numeric. Upper asymptotic value.
• lower: numeric. Lower asymptotic value.
• t: numeric. Year to get logistic value.

Returns

growth_logistic returns the logistic estimation for specified year.

Examples

# Given TFR values 3.32 and 2.85 for the years 1986 and 1991, respectively,
# estimate the TFR in 1987 assuming 1.5 as lower limit and 8 as upper limit.

growth_logistic(pivot_values = c(3.32, 2.85), pivot_years = c(1986, 1991),
upper = 8, lower=1.5, t=1987)

References

Rdpack::insert_ref(key="growth_exp",package="popstudy")

See Also

growth_exp, growth_linear

Author(s)

Cesar Gamboa-Sanabria