| na_aggregate | Replace NAs by aggregation |
| na_all | Determine if all values are missing |
| na_any | Determine if ANY value is NA |
| na_approx | Replace NA by Interpolation |
| na_constant | na_constant |
| na_drop_cols | na_drop_cols |
| na_drop_rows | na_drop_rows |
| na_explicit | na_explicit |
| NA_explicit_ | NA_explicit_ |
| na_fill | Fill NA or specified positions. |
| na_implicit | na_implicit |
| na_inf | Replace NAs with Inf |
| na_locf | Last Observation Carried Forward |
| na_loess | na_loess |
| na_max | na_max |
| na_mean | na_mean |
| na_median | na_median |
| na_min | na_min |
| na_n | Counts how many values are NA |
| na_nocb | na_nocb (_N_ext _O_bservation _C_arried _B_ack ) |
| na_predict | na_predict |
| na_replace | Replace NAs with explicit values |
| na_rm | na_rm |
| na_roughfix.POSIXct | na_roughfix.POXIXct - replace a date/time field |
| na_StructTS | Fill NA or specified positions. |
| na_trim | Trim Leading/Trailing Missing Observations |
| na_which | na_which: Identify missing values |
| na_zero | na_zero |
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