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| CasesTable | Create reports cases after listwise deletion of missing values for time-series cross-sectional data. |
| change | Calculate the changes (absolute, percent, and proportion) changes from a specified lag, including within groups |
| CountSpell | Count spells, including for grouped data |
| dMerge | Merges 2 data frames and report/drop/keeps only duplicates. |
| DropNA | Drop rows from a data frame with missing values on a given variable(s). |
| FillDown | Fills in missing (NA) values with the previous non-missing value |
| FillIn | A function for filling in missing values of a variable from one data frame with the values from another variable. |
| FindDups | Find duplicated values in a data frame and subset it to either include or not include them. |
| FindReplace | Replace multiple patterns found in a character string column of a data frame |
| grepl.sub | Subset a data frame if a specified pattern is found in a character string |
| InsertRow | Inserts a new row into a data frame |
| MoveFront | Move variables to the front of a data frame. |
| NaVar | Create new variable(s) indicating if there are missing values in other variable(s) |
| PercChange | Calculate the percentage change from a specified lag, including within groups |
| rmExcept | Remove all objects from a workspace except those specified by the user. |
| shift | A function for creating lag and lead variables. |
| shiftMA | Internal function for slideMA |
| slide | A function for creating lag and lead variables, including for time-series cross-sectional data. |
| slideMA | Create a moving average for a period before or after each time point for a given variable |
| SpreadDummy | Spread a dummy variable (1's and 0') over a specified time period and for specified groups |
| StartEnd | Find the starting and ending time points of a spell |
| TimeExpand | Expands a data set so that it includes an observation for each time point in a sequence. Works with grouped data. |
| TimeFill | Creates a continuous Unit-Time-Dummy data frame from a data frame with Unit-Start-End times |
| VarDrop | Drop one or more variables from a data frame. |