Args Formatted Argument List of a Function ConvertMedUnits Convert medical measurements between International Standard (SI) and US 'Conventional' Units. MedUnits Table of conversions between Intertional Standard (SI) and US 'Conventional' Units for common medical measurements. aggregate.table Create 2-Way Table of Summary Statistics c.factor Combine factors, properly handling levels combine Combine R Objects With a Column Labeling the Source drop.levels Drop unused factor levels elem Display Information about Elements in a Given Object env Display Information about All Loaded Environments frameApply Subset analysis on data frames 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 or Elements mapLevels Mapping levels matchcols Select columns names matching certain critera nobs Compute the Number of Non-missing Observations read.xls Read Excel files rename.vars Remove or rename variables in a dataframe reorder.factor Reorder the Levels of a Factor resample Consistent Random Samples and Permutations trim Remove leading and trailing spaces from character strings unknownToNA Change unknown values to NA and vice versa unmatrix Convert a matrix into a vector, with appropriate names upperTriangle Extract or replace the upper/lower triangular portion of a matrix write.fwf Write object in fixed width format