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Returns Population Size (Estimated or Fixed)

Source: R/methods.R
pop_size.Rd

Returns population size that is assumed to be

  • fixed – if it is based on the pop_size argument or population totals,

  • estimated – if it is based on the probability survey specified in the svydesign or, for Hajek-type IPW-MLE, on the estimated IPW total for the non-probability sample.

Usage

pop_size(object)

Arguments

object

object returned by the nonprob function.

Value

a scalar returning the value of the population size.

Examples


sample_a <- data.frame(y = c(1, 0, 1, 0, 1), x = c(0, 1, 2, 3, 4))
sample_b <- data.frame(x = c(0.5, 1.5, 2.5, 3.5), w = c(4, 4, 4, 4))
sample_b_svy <- svydesign(ids = ~1, weights = ~w, data = sample_b)

ipw_est1 <- nonprob(
  selection = ~x,
  target = ~y,
  svydesign = sample_b_svy,
  data = sample_a,
  method_selection = "logit",
  se = FALSE
)

ipw_est2 <- nonprob(
  selection = ~x,
  target = ~y,
  svydesign = sample_b_svy,
  data = sample_a,
  method_selection = "logit",
  control_selection = control_sel(est_method = "gee", gee_h_fun = 1),
  se = FALSE
)

## estimated population size based on the non-calibrated IPW (MLE)
pop_size(ipw_est1)
#> pop_size 
#>       16 

## estimated population size based on the calibrated IPW (GEE)
pop_size(ipw_est2)
#> pop_size 
#>       16