check_some_missing      Check if some missing values are present
fill_missing            Fill missing
fill_missing_interval   Fill missing interval
fill_missing_last       Fill missing last
fill_missing_max        Fill missing maximum
fill_missing_min        Fill missing minimum
fill_missing_previous   Fill missing previous
fill_missing_strict     Fill missing strict
fill_value              fill missing value
fill_vector_interval    fill_vector_interval
fill_vector_last        fill_vector_last
fill_vector_max         fill_vector_max
fill_vector_min         fill_vector_min
fill_vector_previous    fill_vector_previous
fill_vector_strict      fill_vector_strict
