Describe Function Arguments
Convert medical measurements between International Standard (SI)
  and US 'Conventional' Units.
Table of conversions between Intertional
  Standard (SI) and US 'Conventional' Units for common medical
  measurements.
Create 2-Way Table of Summary Statistics
Bind two data frames into a multivariate data frame
Column-bind objects with different number of rows
Combine R Objects With a Column Labeling the Source
Drop unused factor levels
Display Information about Elements in a Given Object
Describe All Loaded Environments
Subset analysis on data frames
Various R programming tools for data manipulation
Get date/time parts from date and time objects
Print byte size in human readable format
Interleave Rows of Data Frames or Matrices
Run Multiple is.* Tests on a Given Object
Remove All Objects, Except Those Specified
Describe Objects or Elements
Mapping levels
Select columns names matching certain critera
Number of variable pairs
Compute the Number of Non-missing Observations
Report the Space Allocated for an Object
Read Excel files
Remove or rename variables in a dataframe
Reorder the Levels of a Factor
Consistent Random Samples and Permutations
Run RUnit tests for the gdata package
Count or list sheet names in Excel spreadsheet files.
Remove leading and trailing spaces from character strings
Trim a vector such that the last/first value represents the sum of 
  trimmed values
Change unknown values to NA and vice versa
Convert a matrix into a vector, with appropriate names
Extract or replace the upper/lower triangular portion of a matrix
Create multivariate data by a given factor
Write object in fixed width format