asNumericIfPossible | Convert Columns of a Data Frame Into Numeric Values If... |
collapseMissings | Recode Character Missings of Different Types to 0 or 'NA' |
commonItems | Identify Common Items for Several Groups |
commonItems.percent | Identify Percentage of Common Items for Several Groups |
crop | Remove Trailing and Leading Characters From Character Strings |
dapply | apply a function on data.frame |
fill.na | Replace Missing Values in a Vector |
make.dummies | Create Dummy Variables from a Data Frame |
modus | Compute the Mode of a Variable |
multiseq | multiple sequences |
reading_writing | Reading and writing achievement test data |
reinsort.col | Insert Columns into a Data Frame in a Specific Position |
rmNA | Remove Columns and Rows with Missing Data |
rmNAcols | Remove Columns with Missing Data |
rmNArows | remove NA rows from data |
science1 | Science achievement test data |
science1.context.vars | Science achievement test data - Context variable names |
science1.item.characteristics | Science achievement test data - Item characteristics |
science1.items | Science achievement test data - Item names |
science1.scales | Science achievement test data - Scale definition |
science1.testlets | Science achievement test data - Testlet definition as dummy... |
set.col.type | Set the Class of Columns in a Data Frame |
shade.between.lines | draw a shade between two lines in ggplot2 |
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