dot-delta_method_deriv: Delta method for derivative estimation

In flexFitR: Flexible Non-Linear Least Square Model Fitting

Delta method for derivative estimation

Description

Delta method for derivative estimation

Usage

.delta_method_deriv(fit, x_new, which = "fd")

Arguments

fit	A fit object which is located inside a modeler object
x_new	A vector of x values to evaluate the derivative.
which	Can be "fd" for first-derivative or "sd" for second-derivative.

Value

A data.frame of the evaluated values.

Examples

library(flexFitR)
data(dt_potato)
mod_1 <- dt_potato |>
  modeler(
    x = DAP,
    y = Canopy,
    grp = Plot,
    fn = "fn_lin_plat",
    parameters = c(t1 = 45, t2 = 80, k = 0.9),
    subset = c(15, 2, 45)
  )
print(mod_1)
# First Derivative
predict(mod_1, x = 45, type = "fd", id = 2)

flexFitR documentation built on April 16, 2025, 5:09 p.m.