Drop sites with missing data

Removes sites that cannot be modelled and reports them. Sites with no observed counts (all `n` missing) or without coordinates (all `lat`/`lon` missing) are always dropped. Sites whose observed counts are all zero are dropped only when `drop_zero = TRUE`.

Under the `log1p` per-site-centred rate model an all-zero site is valid low-rate data, not a defect, so it is retained by default; set `drop_zero = TRUE` if all-zero facilities should be treated as reporting artefacts and removed.

Usage

data_missing(data, ..., drop_zero = FALSE)

Arguments

data

A data frame containing site identifiers, time `t`, counts `n`, and coordinates `lat` and `lon`.

...

Columns identifying sites passed to [dplyr::group_by()] (unquoted).

drop_zero

Logical; also drop sites whose observed counts sum to zero (default `FALSE`).

Value

A data frame with problem sites removed.