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.

...

Bare (unquoted) column names that jointly identify a site, e.g. region, facility_name.

drop_zero

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

Value

A data frame with problem sites removed.