Select Best Variance-covariance Model
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This menu can be used to select the best variance-covariance matrix to model the genetic correlations between environments, based on the Schwarz (Bayes) Information Criterion (SIC or BIC) or Akaike Information Criterion (AIC). If data structures have been stored within the QTL workbook then the names of the structures will be automatically entered in the relevant input fields.

Available Data

This lists data structures appropriate to the current input field. Double-click on a name to copy it to the current input field; alternatively, you can type the name directly into the input field. If data has been stored in a QTL workbook then only the data structures present within that workbook will be displayed in the available data, otherwise all the current data within GenStat will be displayed. When data are present within the QTL workbook you can right-click on the available data list to open a shortcut menu where you can change between displaying data only within the workbook and all data within GenStat.

Quantitative trait means

A variate specifying the quantitative trait means.

Genotype factor

A factor specifying the genotype for each mean.

Environment factor

A factor specifying the different environments.

Variance-covariance models

This allows you to select one or more variance-covariance models that are to be compared for the set of environments. The output produced by this menu uses abreviations for the different variance-covariance models. The table below details the descriptions and the abbreviations used in the output. For more details about the models see the VGESELECT procedure.

DescriptionAbbreviation in output
Identityidentity
Compound symmetrycs
Diagonaldiagonal
Uniform covariances with unequal varianceshcs
Uniform correlations with unequal variancesoutside
Factor Analytic Order 1fa
Factor Analytic Order 2fa2
Unstructuredunstructured

Action Buttons

RunRun the analysis.
CancelClose the menu without further changes.
OptionsOpens a dialog where additional options and settings can be specified.
DefaultsSet the menu settings back to the default settings. Clicking the right mouse on this button produces a shortcut menu where you can choose to set the menu using the currently stored defaults or the GenStat default settings.

See Also