silv_sample_size: Calculates sample size for a random sampling inventory

In silviculture: Utility Functions for Forest Inventory and Silviculture

Calculates sample size for a random sampling inventory

Description

Usage

silv_sample_size(
  x,
  plot_size,
  total_area,
  method = "random",
  max_error = 0.05,
  conf_level = 0.95,
  max_iter = 1000,
  quiet = FALSE
)

Arguments

x	vector of field survey
plot_size	a numeric vector of length one with plot size in squared meters
total_area	total area of the study area in squared meters
method	sampling method. Available options are random
max_error	maximum allowed error
conf_level	confidence level
max_iter	maximum number of iteration to find the plot size
quiet	if TRUE, messages will be supressed

Value

SampleSize object

Examples

## pilot inventory measuring 4 plots of 25x25 meters
## total forest area 15 ha
## measured variable (x): basal area per hectare
silv_sample_size(
  x          = c(33, 37.5, 42, 35.2),
  plot_size  = 25 * 25,  # squared plot of 25x25
  total_area = 15 * 1e4, # 15 ha
  max_error  = 0.05,
  conf_level = 0.95,
  max_iter   = 100
)

silviculture documentation built on Nov. 5, 2025, 7:13 p.m.