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| aggregate.table | Create 2-Way Table of Summary Statistics |
| Args | Formatted Argument List of a Function |
| combine | Combine R Objects With a Column Labeling the Source |
| elem | Display Information about Elements in a Given Object |
| env | Display Information about All Loaded Environments |
| interleave | Interleave Rows of Data Frames or Matrices |
| is.what | Run Multiple is.* Tests on a Given Object |
| keep | Remove All Objects, Except Those Specified |
| ll | Display Information about Objects in a Given Environment |
| matchcols | Select columns names matching certain critera |
| nobs | Compute the Number of Non-missing Observations |
| read.xls | Read Excel files |
| remove.vars | Remove or rename variables in a dataframe |
| rename.vars | Remove or rename variables in a dataframe |
| reorder.factor | Reorder the Levels of a Factor |
| trim | Remove leading and trailing spaces from character strings |