US Births in 1969 - 1988

Description

A day by day record of the number of births in each US State.

Usage

data(Birthdays)

Format

A data frame with 374221 observations on the following variables.

• state state where child was born

• year year (1969-1988)

• month month (1-12)

• day day of month

• date date as a date object

• births number of births

Examples

data(Birthdays)
if (require(lattice)) {
  xyplot(births ~ date, Birthdays, subset=state=="CA")
  xyplot(births ~ date, Birthdays, subset=state=="CA", 
    groups=wday, type='l')
  if (require(mosaic)) {
    xyplot(births ~ date, type='l',
      data = Birthdays %>% group_by(date) %>% summarise(births=sum(births)))
    }
  }