Description Usage Arguments Value Author(s) References See Also Examples
Computes the multitrait stability index proposed by Olivoto et al. (2019)
1 2 3 4 5 6 7 8 
.data 
An object of class 
index 
If 
ideotype 
A vector of length 
SI 
An integer (0100). The selection intensity in percentage of the total number of genotypes. 
mineval 
The minimum value so that an eigenvector is retained in the factor analysis. 
verbose 
If 
An object of class mtsi
with the following items:
data The data used to compute the factor analysis.
cormat The correlation matrix among the environments.
PCA The eigenvalues and explained variance.
FA The factor analysis.
KMO The result for the KaiserMeyerOlkin test.
MSA The measure of sampling adequacy for individual variable.
communalities The communalities.
communalities_mean The communalities' mean.
initial_loadings The initial loadings.
finish_loadings The final loadings after varimax rotation.
canonical_loadings The canonical loadings.
scores_gen The scores for genotypes in all retained factors.
scores_ide The scores for the ideotype in all retained factors.
MTSI The multitrait stability index.
contri_fac The relative contribution of each factor on the MTSI value. The lower the contribution of a factor, the close of the ideotype the variables in such factor are.
contri_fac_rank, contri_fac_rank_sel The rank for the contribution of each factor for all genotypes and selected genotypes, respectively.
sel_dif_trait, sel_dif_stab, sel_dif_mps A data frame containing the selection differential (gains) for the traits, for the stability (WAASB index) WAASB, and for the mean performance and stability (WAASBY indexes). The following variables are shown.
VAR
: the trait's name.
Factor
: The factor that traits where grouped into.
Xo
: The original population mean.
Xs
: The mean of selected genotypes.
SD
and SDperc
: The selection differential and selection differential in
percentage, respectively.
h2
: The broadsense heritability.
SG
and SGperc
: The selection gains and selection gains in percentage,
respectively.
sense
: The desired selection sense.
goal
: selection gains match desired sense? 100 for yes and 0 for no.
stat_dif_var, stat_dif_stab, stat_dif_mps A data frame with the descriptive statistic for the selection gains for the traits, for the stability (WAASB index) WAASB, and for the mean performance and stability (WAASBY index). The following variables are shown.
sense
: The desired selection sense.
variable
: the trait's name.
min
: the minimum value for the selection gain.
mean
: the mean value for the selection gain.
ci
: the confidence interval for the selection gain.
sd.amo
: the standard deviation for the selection gain.
max
: the maximum value for the selection gain.
sum
: the sum of the selection gain.
sel_gen The selected genotypes.
Tiago Olivoto tiagoolivoto@gmail.com
Olivoto, T., A.D.C. L\'ucio, J.A.G. da silva, B.G. Sari, and M.I. Diel. 2019. Mean performance and stability in multienvironment trials II: Selection based on multiple traits. Agron. J. 111:29612969. doi: 10.2134/agronj2019.03.0220
mgidi()
, waasb()
, get_model_data()
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22  library(metan)
# Based on stability only, for both GY and HM, higher is better
mtsi_model <
waasb(data_ge,
env = ENV,
gen = GEN,
rep = REP,
resp = c(GY, HM))
mtsi_index <
mtsi(mtsi_model, index = 'waasb')
# Based on mean performance and stability (using pipe operator %>%)
# GY: higher is better
# HM: lower is better
mtsi_index2 <
data_ge %>%
waasb(ENV, GEN, REP,
resp = c(GY, HM),
mresp = c("h, l")) %>%
mtsi()

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