A0-collapse-documentation
                        Collapse Documentation & Overview
A1-fast-statistical-functions
                        Fast (Grouped, Weighted) Statistical Functions
                        for Matrix-Like Objects
A2-fast-grouping        Fast (Ordered) Grouping
A3-data-frame-manipulation
                        Fast Data Frame 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 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_ Global Options
collapse-package        Advanced and Fast Data Transformation
dapply                  Data Apply
descr                   Detailed Statistical Description of Data Frame
fFtest                  Fast F-test of 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) Median Value for Matrix-Like
                        Objects
fmode                   Fast (Grouped, Weighted) Statistical Mode for
                        Matrix-Like Objects
fprod                   Fast (Grouped, Weighted) Product for
                        Matrix-Like Objects
fscale                  Fast (Grouped, Weighted) Scaling and Centering
                        of Matrix-like Objects
fsubset                 Fast Subsetting
fsum                    Fast (Grouped, Weighted) Sum for Matrix-Like
                        Objects
ftransform              Fast Transform and Compute Columns on a Data
                        Frame
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 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
select-replace-vars     Fast Select, Replace or Add Data Frame Columns
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
