A0-collapse-documentation
                        Collapse Documentation & Overview
A1-fast-statistical-functions
                        Fast (Grouped, Weighted) Statistical Functions
                        for Matrix-Like Objects
A2-fast-grouping-ordering
                        Fast Grouping and Ordering
A3-fast-data-manipulation
                        Fast Data Manipulation
A4-quick-conversion     Quick Data Conversion
A6-data-transformations
                        Data Transformations
A7-time-series-panel-series
                        Time Series and Panel Series
A8-list-processing      List Processing
A9-summary-statistics   Summary Statistics
AA1-recode-replace      Recode and Replace Values in Matrix-Like
                        Objects
AA2-small-helpers       Small (Helper) Functions
B                       Fast Between (Averaging) and (Quasi-)Within
                        (Centering) Transformations
BY                      Split-Apply-Combine Computing
GGDC10S                 Groningen Growth and Development Centre
                        10-Sector Database
GRP                     Fast Grouping / _collapse_ Grouping Objects
TRA                     Transform Data by (Grouped) Replacing or
                        Sweeping out Statistics
atomic_elem             Find and Extract / Subset List Elements
collap                  Advanced Data Aggregation
collapse-depreciated    Depreciated _collapse_ Functions
collapse-options        _collapse_ Package Options
collapse-package        Advanced and Fast Data Transformation
colorder                Fast Reordering of Data Frame Columns
dapply                  Data Apply
descr                   Detailed Statistical Description of Data Frame
fFtest                  Fast F-test for Linear Models (with Factors)
fHDbetween              Higher-Dimensional Centering and Linear
                        Prediction
fNdistinct              Fast (Grouped) Distinct Value Count for
                        Matrix-Like Objects
fNobs                   Fast (Grouped) Observation Count for
                        Matrix-Like Objects
fdiff                   Fast (Quasi-, Log-) Differences for Time Series
                        and Panel Data
ffirst                  Fast (Grouped) First and Last Value for
                        Matrix-Like Objects
fgrowth                 Fast Growth Rates for Time Series and Panel
                        Data
flag                    Fast Lags and Leads for Time Series and Panel
                        Data
fmax                    Fast (Grouped) Maxima and Minima for
                        Matrix-Like Objects
fmean                   Fast (Grouped, Weighted) Mean for Matrix-Like
                        Objects
fmedian                 Fast (Grouped, Weighted) Median Value for
                        Matrix-Like Objects
fmode                   Fast (Grouped, Weighted) Statistical Mode for
                        Matrix-Like Objects
fnth                    Fast (Grouped, Weighted) N'th Element/Quantile
                        for Matrix-Like Objects
fprod                   Fast (Grouped, Weighted) Product for
                        Matrix-Like Objects
frename                 Fast Renaming Objects
fscale                  Fast (Grouped, Weighted) Scaling and Centering
                        of Matrix-like Objects
fselect                 Fast Select, Replace or Add Data Frame Columns
fsubset                 Fast Subsetting Matrix-Like Objects
fsum                    Fast (Grouped, Weighted) Sum for Matrix-Like
                        Objects
ftransform              Fast Transform and Compute Columns on a Data
                        Frame
funique                 Fast Unique Elements / Rows
fvar                    Fast (Grouped, Weighted) Variance and Standard
                        Deviation for Matrix-Like Objects
groupid                 Generate Run-Length Type Group-Id
is.unlistable           Regular Objects and Unlistable Lists
ldepth                  Determine the Depth / Level of Nesting of a
                        List
psacf                   Auto- and Cross- Covariance and Correlation
                        Function Estimation for Panel Series
psmat                   Matrix / Array from Panel Series
pwcor                   Pairwise Correlations, Covariances and
                        Observation Count
qF                      Fast Factor Generation, Interactions and Vector
                        Grouping
qsu                     Fast (Grouped, Weighted) Summary Statistics for
                        Cross-Sectional and Panel Data
radixorder              Fast Radix-Based Ordering
rapply2d                Recursively Apply a Function to a List of Data
                        Objects
roworder                Fast Reordering of Data Frame Rows
seqid                   Generate Group-Id from Integer Sequences
unlist2d                Recursive Row-Binding / Unlisting in 2D - to
                        Data Frame
varying                 Fast Check of Variation in Data
wlddev                  World Development Dataset
