An establishment with agricultural area area inside cell unit is hit by
a point of that cell with expected count density * area; summed over the
cells it spans, this is the multiplicity factor that point_estimator()
divides by. Cells outside the sample contribute pi * points / area as
well, so the expectation is over the whole design; supply points_per_cell
for them.
Arguments
- areas
Data frame with columns
establishment,unit(cell) andarea(agricultural area of the establishment inside that cell, in the square units ofcell_size).- sample
The
fieldopt_sampleof cells.- points_per_cell
As in
select_points(), applied to every cell of the frame.- cell_size
As in
select_points().