statar (version 0.6.2)

is.panel: Check whether a data.frame is a panel

Description

Check whether a data.frame is a panel

Usage

is.panel(x, ...)
is.panel_(x, ..., .dots)

Arguments

x

a data frame

...

a time variable

.dots

Used to work around non standard evaluation

Value

The function is.panel check that there are no duplicate combinations of the variables in ... and that no observation is missing for the last variable in ... (the time variable).

Examples

library(dplyr)
df <- data_frame(
    id1    = c(1, 1, 1, 2, 2),
    id2   = 1:5,
    year  = c(1991, 1993, NA, 1992, 1992),
    value = c(4.1, 4.5, 3.3, 3.2, 5.2)
)
df %>% group_by(id1) %>% is.panel(year)
df1 <- df %>% filter(!is.na(year))
df1 %>% is.panel(year)
df1 %>% group_by(id1) %>% is.panel(year)
df1 %>% group_by(id1, id2) %>% is.panel(year)