| % File src/library/datasets/man/presidents.Rd |
| % Part of the R package, https://www.R-project.org |
| % Copyright 1995-2007 R Core Team |
| % Distributed under GPL 2 or later |
| |
| \name{presidents} |
| \docType{data} |
| \alias{presidents} |
| \title{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. |
| } |
| \source{ |
| The Gallup Organisation. |
| } |
| \details{ |
| The data are actually a fudged version of the approval ratings. See |
| McNeil's book for details. |
| } |
| \references{ |
| McNeil, D. R. (1977) |
| \emph{Interactive Data Analysis}. |
| New York: Wiley. |
| } |
| \examples{ |
| require(stats); require(graphics) |
| plot(presidents, las = 1, ylab = "Approval rating (\%)", |
| main = "presidents data") |
| } |
| \keyword{datasets} |