silv_sample_size {silviculture} | R Documentation |
Calculates sample size for a random sampling inventory
Description
Calculates sample size for a random sampling inventory
Usage
silv_sample_size(
x,
plot_size = 100,
total_area = 150000,
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 |
max_error |
maximum allowed error |
conf_level |
confidence level |
max_iter |
maximum number of iteration to find the plot size |
quiet |
if |
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
)
[Package silviculture version 0.1.0 Index]