Fills in missing (NA) values with the previous non-missing value
Drop rows from a data frame with missing values on a given variable(s).
Move variables to the front of a data frame.
Find the starting and ending time points of a spell
Subset a data frame if a specified pattern is found in a character string
Remove all objects from a workspace except those specified by the user.
Internal function for slideMA
A function for creating lag and lead variables.
Count spells, including for grouped data
Create new variable(s) indicating if there are missing values in other
variable(s)
Creates a continuous Unit-Time-Dummy data frame from a data frame with Unit-Start-End times
A function for creating lag and lead variables, including for time-series
cross-sectional data.
Inserts a new row into a data frame
Replace multiple patterns found in a character string column of a data frame
Create a moving average for a period before or after each time point for a
given variable
Spread a dummy variable (1's and 0') over a specified time period and for
specified groups
Calculate the percentage change from a specified lag, including withing group
A function for filling in missing values of a variable from one data frame
with the values from another variable.
Drop one or more variables from a data frame.
Merges 2 data frames and report/drop/keeps only duplicates.