| demean | Removes measure of centrality from the series |
| demean-demedian | Removes measure of centrality from the series |
| demedian | Removes measure of centrality from the series |
| demode | Removes measure of centrality from the series |
| diffx | Compute lagged differnces |
| diffx-rdiffx-ldiffx | Compute lagged differnces |
| dtrend | Deterministic Trend |
| dtrend_lin | Deterministic Trend |
| dtrend_poly | Deterministic Trend |
| dtrend_quad | Deterministic Trend |
| fill_linear | Fill with "linear approximation" |
| fill_locf | Fill with "Last Observation Carried Forward" |
| fill_nocb | Fill with "Next observation carried backwards" |
| fill_spline | Fill with "cubic spline interpolation" |
| filter_bk | Baxter-King Filter |
| filter_bw | Butterworth Filter |
| filter_cf | Christiano-Fitzgerald Filter |
| filter_hamilton | Hamilton Filter |
| filter_hp | Hodrick-Prescot Filter |
| filter_tr | Trigonometric regression Filter |
| gmean | Geometric Mean value |
| kurtosis | Skewness/Kurtosis Value |
| lagx | Compute lagged or leading values |
| ldiffx | Compute lagged differnces |
| leadx | Compute lagged or leading values |
| leadx-lagx | Compute lagged or leading values |
| modex | Mode value |
| modex_int | Mode value |
| out_iqr | Detect outliers with Tukey's method |
| out_pt | Detect outliers with Percentiles |
| out_score_z | Detect outliers with zscore |
| out_score_zrob | Detect outliers Iglewicz and Hoaglin (1993) robust z-score method |
| out_threshold | Detect outliers with upper and lower threshold |
| out_winsorise | Winsorize |
| out_winsorize | Winsorize |
| pow | nth Power Transformation |
| pow_boxcox | Box-Cox Transformations |
| pow_manly | Manly(1971) Transformations |
| pow_tukey | Tukey Transformations Transformations |
| pow_yj | Yeo and Johnson(2000) Transformations |
| rdiffx | Compute lagged differnces |
| rebase | Change the base year |
| rebase_origin | Change the base year |
| root | nth Root Transformation |
| root_cubic | nth Root Transformation |
| root_sq | nth Root Transformation |
| scale_minmax | Rescale |
| scale_range | Rescale |
| scale_unit_len | Rescale |
| score | Score transformation |
| score_chisq | Score transformation |
| score_mad | Score transformation |
| score_t | Score transformation |
| score_z | Score transformation |
| select_lambda | Selecting lambda |
| skewness | Skewness/Kurtosis Value |
| std | Standarization |
| std_mean | Standarization |
| std_median | Standarization |