stability.hue: Nonparametric stability analysis

In agrostab: Stability Analysis for Agricultural Research

Description

This function calculates the Nassar&Huehn's stability parameters.

Usage

stability.hue(dataf, res_var, gen_var, env_var, rep_var, alpha = 0.05,
  plotIt = TRUE)

Arguments

dataf	the name of the data frame containing the data to analyze.
res_var	the response variable.
gen_var	the genotypes variable.
env_var	the environments variable.
rep_var	the replications variable.
alpha	the significance level; default is 0.5
plotIt	a logical value specifying if plot should be drawn; default is TRUE

Value

Returns a list of two objects:

statistic

the data frame object of stability analysis results:

• S1-value of genotype

• Z1-value of genotype

• S2-value of genotype

• Z2-value of genotype

scores

the data frame object of summary results:

• Z1.sum sum of Z1

• Z2.sum sum of Z2

• chi.ind chi-squared for (choosen alpha level)/(number of genotypes) and one degree of freedom

• chi.sum chi-squared for choosen alpha level and number of genotypes degree of freedom

References

Nassar, R. and M. Huehn. 1987. Studies on estimation of phenotypic stability: Tests of significance for nonparametric measures of phenotypic stability. Biometrics 43: 45-53. doi: 10.2307/2531947

Examples

data(exp_data)
stability.hue(exp_data,"yield","gen","env","rep")

Example output

$statistic
                S1        Z1       S2         Z2
Novosib2  3.066667 1.9321839 7.066667 3.06666667
Novosib3  2.466667 0.1037356 4.300000 0.02934783
Novosib32 3.133333 2.2761494 6.966667 2.86992754
Novosib40 1.266667 3.2899425 1.366667 2.26123188
Novosib51 1.800000 0.7474138 2.166667 1.09601449
Obskaya_o 2.800000 0.8379310 5.466667 0.70144928
Omskaya6  2.533333 0.1942529 4.666667 0.14492754

$chi
    Z1.sum   Z2.sum  chi.ind  chi.sum
1 9.381609 10.16957 7.236689 14.06714

agrostab documentation built on Oct. 30, 2019, 10:51 a.m.