DataCombine (version 0.2.21)

SpreadDummy: Spread a dummy variable (1's and 0') over a specified time period and for specified groups

Description

Spread a dummy variable (1's and 0') over a specified time period and for specified groups

Usage

SpreadDummy(data, Var, GroupVar, NewVar, spreadBy = -2, reminder = TRUE)

Arguments

data

a data frame object.

Var

a character string naming the numeric dummy variable with values 0 and 1 that you would like to spread. Can be either spread as a lag or lead.

GroupVar

a character string naming the variable grouping the units within which Var will be spread If GroupVar is missing then the whole variable is spread up or down. This is similar to shift, though shift slides the data and returns it to a new vector rather than the original data frame.

NewVar

a character string specifying the name for the new variable to place the spread dummy data in.

spreadBy

numeric value specifying how many rows (time units) to spread the data over. Negative values spread the data down--lag the data. Positive values spread the data up--lead the data.

reminder

logical. Whether or not to remind you to order your data by the GroupVar and time variable before running SpreadDummy.

See Also

slide

Examples

# Create dummy data
ID <- sort(rep(seq(1:4), 5))
NotVar <- rep(1:5, 4)
Dummy <-  sample(c(0, 1), size = 20, replace = TRUE)
Data <- data.frame(ID, NotVar, Dummy)

# Spread
DataSpread1 <- SpreadDummy(data = Data, Var = 'Dummy',
                           spreadBy = 2, reminder = FALSE)

DataSpread2 <- SpreadDummy(data = Data, Var = 'Dummy', GroupVar = 'ID',
                           spreadBy = -2)