| eval_dates | Evaluate completeness of dates |
| eval_sign | Evaluate the sign of data |
| find_gaps | Identify gaps in a sequence of dates |
| local_max_index | Find indexed local minima/maxima |
| local_min_index | Find indexed local minima/maxima |
| local_x_index | Find indexed local minima/maxima |
| qw_stats | Calculate summary statistics |
| rollmean_date | Rolling mean of values indexed by date |
| streamdat | Stream Discharge and Specific Conductivity |
| subsample | Convert a daily record to discrete |
| subsample_routine | Convert a daily record to periodic discrete |
| summarize_seasons | Seasonal and monthly value ranking |
| thresholds | Find thresholds for each season |