pub fn presidents() -> Result<DataFrame, PolarsError>Expand description
§Quarterly Approval Ratings of US Presidents
§Description:
The (approximately) quarterly approval rating for the President of the United States from the first quarter of 1945 to the last quarter of 1974.
§Usage:
presidents
§Format:
A time series of 120 values.
§Details:
The data are actually a fudged version of the approval ratings. See McNeil’s book for details.
§Source:
The Gallup Organisation.
§References:
McNeil, D. R. (1977) Interactive Data Analysis. New York: Wiley.
§Examples:
require(stats); require(graphics)
plot(presidents, las = 1, ylab = "Approval rating (%)",
main = "presidents data")