Add dataset from acidity of mango fruits per variety.

data-raw/mangoAcidity.R

+##----------------------------------------------------------------------
+## Data generation.
+
+mangoAcidity <- expand.grid(variety=c("Bourbon", "Brasil", "Extrema",
+                                      "Maçã", "Non Plus Ultra",
+                                      "Oliveira"),
+                            year=c(1957:1959),
+                            month=c("N", "D", "J"),
+                            KEEP.OUT.ATTRS=FALSE)
+mangoAcidity$acid <- c(28.2, 38.3, 37.6, 47.2, 36.4, 40.0, 24.7, 32.0,
+                       39.0, 47.7, 35.3, 30.1, 16.4, 38.4, 50.3, 50.2,
+                       40.1, 30.0, 6.0, 5.0, 6.0, 6.2, 7.9, 6.0, 6.2,
+                       3.6, 6.6, 6.9, 10.2, 7.0, 6.9, 4.0, 6.9, 7.9,
+                       9.8, 8.4, 4.6, 4.6, 5.4, 5.2, 4.9, 6.1, 4.4,
+                       4.2, 5.4, 4.2, 6.8, 3.5, 5.0, 3.8, 5.0, 5.0,
+                       7.0, 4.8)
+str(mangoAcidity)
+
+save(mangoAcidity, file="../data/mangoAcidity.RData")
+
+##----------------------------------------------------------------------
+## Examples.
+
+library(lattice)
+library(latticeExtra)
+
+data(mangoAcidity)
+str(mangoAcidity)
+
+## reshape::cast() can also be used.
+with(mangoAcidity,
+     ftable(tapply(acid,
+                   list(variety, year, month),
+                   FUN=identity)))
+
+xyplot(acid~month|variety, groups=year,
+       data=mangoAcidity, type=c("p", "a"),
+       auto.key=TRUE,
+       ylab="Acidity",
+       xlab="Month")
+
+rm(list=ls())
+load("../data/mangoAcidity.RData")
+ls()
+str(mangoAcidity)

man/mangoAcidity.Rd

+% Generated by roxygen2 (4.1.1): do not edit by hand
+% Please edit documentation in R/legTools.R
+\docType{data}
+\name{mangoAcidity}
+\alias{mangoAcidity}
+\title{Acidity of mango fruits by varieties, years and months}
+\format{a \code{data.frame} with 54 records and 6 variables.}
+\source{
+Frederico, P. (2009). Curso de Estatística Experimental (15th
+    ed.). Piracicaba, São Paulo: FEALQ. (page 132)
+
+Simão, S. (1960). Estudo da planta e dos frutos da mangueira
+    (\emph{Manginifera indica} L.). Piracicaba, 1960. Thesis.
+}
+\usage{
+data(sugarcaneYield4)
+}
+\description{
+These data are from an observational study along 3 years
+    where acidity in fruits of 6 varieties of mango was determined in
+    Novermber, December and January.
+
+\itemize{
+  \item \code{variety} a categorical variable with 6 levels that
+    represents mango varieties studied.
+  \item \code{year} the year of harvesting.
+  \item \code{month} the month of harvesting.
+  \item \code{acid} mean of the acidity determined in 3 fruits.
+}
+}
+\examples{
+library(lattice)
+library(latticeExtra)
+
+data(mangoAcidity)
+str(mangoAcidity)
+
+## reshape::cast() can also be used.
+with(mangoAcidity,
+     ftable(tapply(acid,
+                   list(variety, year, month),
+                   FUN=identity)))
+
+xyplot(acid~month|variety, groups=year,
+       data=mangoAcidity, type=c("p", "a"),
+       auto.key=TRUE,
+       ylab="Acidity",
+       xlab="Month")
+}
+\keyword{datasets}
+