R/ComasOxapampa.R

In myaseen208/agricolae: Statistical Procedures for Agricultural Research

#' @title Data AUDPC Comas - Oxapampa
#' @name   ComasOxapampa
#' @docType data
#' @keywords datasets
#' @usage data(ComasOxapampa)
#' @description
#' Fifty-three potato varieties developed by the breeding program of the
#' International Potato Center and released in different countries around the
#' world were evaluated for their resistance to late blight in two locations in
#' Peru.
#' 
#' The experimental design was a randomized complete block design with 3
#' replications of 15 apical stem cuttings in Oxapampa and 10 tubers in
#' Mariscal Castilla.  Plots were 11.9 x 18.5 m in size with 30 cm in-row and
#' 0.9 m between-row spacings.  Spreader rows around plots were used at each
#' site. Mancozeb was applied weekly until 30 days after transplanting or
#' planting, after which the plants were left to natural infection.  Due to
#' climatic conditions not conductive to the disease in Oxapampa, inoculum was
#' enhanced with local isolate (POX 067, with virulence R1, 2, 3, 4, 5, 6, 7,
#' 10, 11) at a concentration of 5000-sporangia/ ml at 49 days after planting.
#' Percentage of foliar infection was estimated visually every 3 days for 8
#' times in Oxapampa and every 7 days for 12 times in Comas, then values were
#' converted to the relative area under the diseases progress curve (rAUPDC).
#' rAUDPC rankings were analyzed for phenotypic stability with nonparametric
#' measures.
#' 
#' @format A data frame with 168 observations on the following 4 variables.
#' 
#' @details
#'        \itemize{
#'        \item{\strong{cultivar}} cultivar
#'        \item{\strong{replication}} replication
#'        \item{\strong{comas}} comas
#'        \item{\strong{oxapampa}} oxapampa
#'        } 
#'        
#' @references 
#' International Potato Center. CIP - Lima Peru.
#' 
#' @source 
#' Experimental field, 2002. Data Kindly provided by Wilmer Perez.
#' 
#' @keywords datasets
#' @examples
#' 
#' library(agricolae)
#' data(ComasOxapampa)
#' # Oxapampa (10 35 31 S latitude, 75 23 0 E longitude, 1813 m.a.s.l )
#' # Comas, Mariscal Castilla (11  42  54  S latitude, 75 04 45 E longitude, 2800 m.a.s.l,)
#' # cultivars LBr-40 (resistant), Cruza 148 (moderately resistant) and Pimpernell (susceptible)
#' str(ComasOxapampa)
#' means <- tapply.stat(ComasOxapampa[,3:4],ComasOxapampa$cultivar,mean)
#' correlation(means$comas,means$oxapampa, method="kendall")
#' 
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