Extract per-site effort contributions from a bus-route estimate

Returns the per-site calculation table (eᵢ, πᵢ, eᵢ/πᵢ) stored as an attribute on effort estimate objects returned by estimate_effort() for bus-route survey designs. This table enables traceability of the Horvitz-Thompson estimator (Jones & Pollock 2012, Eq. 19.4) and supports validation against published examples (Malvestuto 1996, Box 20.6).

Usage

get_site_contributions(x)

Arguments

x

A creel_estimates object returned by estimate_effort() for a bus-route design.

Value

A tibble with columns:

site

Site identifier (from sampling frame)

circuit

Circuit identifier (from sampling frame)

e_i

Enumeration-expanded effort at site i (effort * expansion)

pi_i

Inclusion probability for site i (p_site * p_period)

e_i_over_pi_i

Site contribution to Horvitz-Thompson estimate

References

Jones, C. M., & Pollock, K. H. (2012). Recreational survey methods: estimating effort, harvest, and abundance. In A. V. Zale, D. L. Parrish, & T. M. Sutton (Eds.), Fisheries Techniques (3rd ed., pp. 883-919). American Fisheries Society.

See also

estimate_effort(), get_sampling_frame(), get_inclusion_probs(), get_enumeration_counts()

Other "Bus-Route Helpers": get_enumeration_counts(), get_inclusion_probs(), get_sampling_frame()

Examples

# (Bus-route design + add_interviews() required — see estimate_effort() docs)
# After: result <- estimate_effort(design_with_br_interviews)
# site_table <- get_site_contributions(result)