Builds a heatmap of non-missing counts by wave for selected items.
Usage
plot_coverage(
data,
wave_col = "year",
ques_cols = NULL,
ques_stem = NULL,
show_labels = TRUE
)
Arguments
- data
Data frame containing the survey items.
- wave_col
Column with wave identifiers (e.g., year).
- ques_cols
Optional character vector of question columns to include.
- ques_stem
Optional vector of substrings/regex used to match columns.
- show_labels
Logical; draw percentage labels on tiles.
