gomez.heteroskedastic.Rd
RCB experiment of rice, heteroskedastic varieties
data("gomez.heteroskedastic")
A data frame with 105 observations on the following 4 variables.
gen
genotype
group
group of genotypes
rep
replicate
yield
yield
RCB design with three reps. Genotypes 1-15 are hybrids, 16-32 are parents, 33-35 are checks.
Gomez, K.A. and Gomez, A.A.. 1984, Statistical Procedures for Agricultural Research. Wiley-Interscience. Page 310.
Used with permission of Kwanchai Gomez.
None.
library(agridat) data(gomez.heteroskedastic) dat <- gomez.heteroskedastic # Fix the outlier as reported by Gomez p. 311 dat[dat$gen=="G17" & dat$rep=="R2","yield"] <- 7.58 libs(lattice) bwplot(gen ~ yield, dat, group=as.numeric(dat$group), ylab="genotype", main="gomez.heterogeneous")#> Analysis of Variance Table #> #> Response: yield #> Df Sum Sq Mean Sq F value Pr(>F) #> rep 2 3.306 1.65304 5.6164 0.005528 ** #> gen 34 40.020 1.17705 3.9992 5.806e-07 *** #> Residuals 68 20.014 0.29432 #> --- #> Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1## Response: yield ## Df Sum Sq Mean Sq F value Pr(>F) ## rep 2 3.306 1.65304 5.6164 0.005528 ** ## gen 34 40.020 1.17705 3.9992 5.806e-07 *** ## Residuals 68 20.014 0.29432