pibble: Create a pibble panel data set object

In pmdplyr: 'dplyr' Extension for Common Panel Data Maneuvers

Description

This function declares a pibble tibble with the attributes .i, .t, and .d.

Usage

pibble(..., .i = NULL, .t = NULL, .d = 1, .uniqcheck = FALSE)

Arguments

...	A set of name-value pairs to make up the variables of a pibble.
.i	Quoted or unquoted variable(s) that identify the individual cases. If this is omitted, pibble will assume the data set is a single time series.
.t	Quoted or unquoted variable indicating the time. pmdplyr accepts two kinds of time variables: numeric variables where a fixed distance .d will take you from one observation to the next, or, if .d=0, any standard variable type with an order. Consider using the time_variable() function to create the necessary variable if your data uses a Date variable for time.
.d	Number indicating the gap in t between one period and the next. For example, if .t indicates a single day but data is collected once a week, you might set .d=7. To ignore gap length and assume that "one period ago" is always the most recent prior observation in the data, set .d=0. By default, .d=1.
.uniqcheck	Logical parameter. Set to TRUE to perform a check of whether .i and .t uniquely identify observations, and present a message if not. By default this is set to FALSE and the warning message occurs only once per session.

Details

• .i, Quoted or unquoted variable(s) indicating the individual-level panel identifier

• .t, Quoted or unquoted variable indicating the time variable

• .d, a number indicating the gap

The pibble() function is for the purpose of creating pibble objects from scratch. You probably want as_pibble.

Note that pibble does not require that .i and .t uniquely identify the observations in your data, but it will give a warning message (a maximum of once per session, unless .uniqcheck=TRUE) if they do not.

Examples

# Creating a pibble from scratch
pd <- pibble(
  i = c(1, 1, 1, 2, 2, 2),
  t = c(1, 2, 3, 1, 2, 2),
  x = rnorm(6),
  .i = i,
  .t = t
)
is_pibble(pd)
# I set .d=0 here to indicate that I don't care how large the gap between one period and the next is
# If I want to use 'seconds' for t.
# See time_variable() to turn unruly variables into well-behaved integers, as well
pd2 <- pibble(
  i = c(1, 1, 1, 2, 2, 2),
  seconds = c(123, 456, 789, 103, 234, 238),
  .i = i,
  .t = seconds,
  .d = 0
)
is_pibble(pd2)

pmdplyr documentation built on July 2, 2020, 4:08 a.m.