Tools for Easily Combining and Cleaning Data Sets
Drop one or more variables from a data frame.
Create reports cases after listwise deletion of missing values for tim...
Calculate the changes (absolute, percent, and proportion) changes from...
Count spells, including for grouped data
Merges 2 data frames and report/drop/keeps only duplicates.
Drop rows from a data frame with missing values on a given variable(s)...
Fills in missing (NA) values with the previous non-missing value
A function for filling in missing values of a variable from one data f...
Find duplicated values in a data frame and subset it to either include...
Replace multiple patterns found in a character string column of a data...
Subset a data frame if a specified pattern is found in a character str...
Inserts a new row into a data frame
Move variables to the front of a data frame.
Create new variable(s) indicating if there are missing values in other...
Calculate the percentage change from a specified lag, including within...
Remove all objects from a workspace except those specified by the user...
A function for creating lag and lead variables.
Internal function for slideMA
A function for creating lag and lead variables, including for time-ser...
Create a moving average for a period before or after each time point f...
Spread a dummy variable (1's and 0') over a specified time period and ...
Find the starting and ending time points of a spell
Expands a data set so that it includes an observation for each time po...
Creates a continuous Unit-Time-Dummy data frame from a data frame with...
Tools for combining and cleaning data sets, particularly with grouped and time series data.
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