Tools for Easily Combining and Cleaning Data Sets.
DataCombine
Christopher Gandrud
Please report any bugs or suggestions at: https://github.com/christophergandrud/DataCombine/issues.
Motivation and Functions
DataCombine is a set of miscellaneous tools intended to make combining data sets--especially time-series cross-section data--easier. The package is continually being developed as I turn lines of code that I frequently use into single functions. It currently includes the following functions:
CasesTable
function added to report cases after listwise deletion of missing values for time-series cross-sectional data.change
: calculates the absolute, percentage, and proportion change from a specified lag, including within groups.CountSpell
: function that returns a variable counting the spell number for an observation. Works with grouped data.dMerge
: merges 2 data frames and report/drop/keeps only duplicates.DropNA
: drops rows from a data frame when they have missing (NA
) values on a given variable(s).FillDown
: fills in missing (NA
) values with the previous non-missing valueFillIn
: fills in missing values of a variable from one data frame with the values from another variable.FindDups
: find duplicated values in a data frame and subset it to either include or not include them.FindReplace
: replaces multiple patterns found in a character string column of a data frame.grepl.sub
: subsets a data frame if a specified pattern is found in a character string.InsertRow
: allows user to insert a row into a data frame. Largely implements: Ari B. Friedman's function.MoveFront
: moves variables to the front of a data frame. This can be useful if you have a data frame with many variables and want to move a variable or variables to the front.NaVar
: create new variable(s) indicating if there are missing values in other variable(s).shift
: creates lag and lead variables, including for time-series cross-sectional data. The shifted variable is returned to a new vector. This function is largely based on TszKin Julian's shift function.slide
: creates lag and lead variables, including for time-series cross-sectional data. The slid variable are added to the original data frame. This expands the capabilities ofshift
.slideMA
: creates a moving average for a period before or after each time point for a given variable.SpreadDummy
: spread a dummy variable (1's and 0') over a specified time period and for specified groups.StartEnd
: finds the starting and ending time points of a spell, including for time-series cross-sectional data.rmExcept
: removes all objects from a workspace except those specified by the user.TimeExpand
: expands a data set so that it includes an observation for each time point in a sequence. Works with grouped data.TimeFill
: creates a continuousUnit
-Time
-Dummy
data frame from a data frame withUnit
-Start
-End
times.VarDrop
: drops one or more variables from a data frame.
Updates
I will continue to add to the package as I build data sets and run across other pesky tasks I do repeatedly that would be simpler if they were completed by a single function.
Installation
DataCombine is on CRAN.
You can also install the most recent stable version with install_github
from the devtools:
devtools::install_github('christophergandrud/DataCombine')