US Births in 1978

Description

A day by day record of the number of births in the United States in 1978.

Usage

data(Births78)

Format

A data frame with 365 observations on the following variables.

• date date in 1978

• births number of US births

• dayofyear sequential number of days from 1 to 365

• wday day of week as an ordered factor

Examples

data(Births78)
if (require(lattice)) {
  xyplot(births ~ date, Births78)
  xyplot(births ~ date, Births78, groups = wday)
}