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The original 217 environments have been reduced to 161 environments in Eastern and Southern Africa.
Setup Trait Filter
Filter and weight the query results by phenotypic parameters. For each trait, every observation included in the environments filter will be scored as passing or failing to meet the phenotypic criteria for that trait. A combined score across all of the traits is also calculated (see details below). The contribution of the individual traits to the combined score can be weighted as being Critical, Important, or Desirable to reflect its importance.
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Asperillus flavus ear rot (AflavER_1_5) has 5 categories. In this example, the results are restricted to those germplam with Asperillus flavus ear rot scores of highly resistant (1) and resistant (2).
How Success Ratios Are Calculated
Individual Trait Success Ratios
Success ratios are calculated based on whether an observed value of the trait meets the criteria set in the 'Setup the Trait Filter' pane. Observations that meet the criteria are assigned a score of +1 while observations that do not meet the criteria are assigned a value of -1. For example, if the trait of interest is Grain Moisture and the criterion is that the observed value is < 19 then an observed value of 18.9 would be assigned a score of +1 and an observed value of 19.1 would be assigned -1. Each observation is weighted based on the weight assigned in the 'Specify and Weight the Environments' pane. The Choices under the WEIGHT column in the 'Setup and Weight Environments' pane are 'Ignored', 'Desirable', 'Important', and 'Critical' which are assigned weights of 0, 1, 2, and 3, respectively.
For each trait, a weighted average is calculated for each line for which there are observations in one or more of the environments selected in the 'Specify and Weight the Environments' pane. The weighted average is presented under the SUCCESS RATIO column for each trait along with the number of observations included in the weighted average.
Combined Score
A combined score is also provided in the results pane. The combined score is a weighted average of the success ratios of all of the traits included in the query. The weight of each trait is the weight assigned in the 'Setup the Trait Filter' pane. The Choices under the WEIGHT column in the 'Setup the Trait Filter' pane are 'Ignored', 'Desirable', 'Important', and 'Critical' which are assigned weights of 0, 1, 2, and 4, respectively. Note that the number of observations of a trait doesn't factor into the combined score, only the success ratio and the weight assigned to each trait.
Formulas used to calculate Success Ratios and Combined Scores
Individual trait Success Ratios are calculated based on observations (subscript l) of traits (subscript j) for lines (subscript i) in environments (subscript k). Let Rijkl be +1 if observation Oijkl is within limits for trait j, and -1 if it is outside the acceptable limits. Then a score for line i and trait j over all environments k could be Rij.. = ∑k Ek ∑l Rijkl/nijk where nijk is the number of observations of trait j for line i in environment k and Ek is 1.0/Nij (where Nij is the number of environments where trait j was measured on line i) if all selected environments have equal weight or it is Wk/∑k Wk if the environments have different weights.
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Four germplasm have combined scores of 1.0 and will be selected for inclusion in an upcoming study.
Tag & Save Germplasm
Tag germplasm of interest and Save to List.
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Specify the germplasm list details and Save. The germplasm list now available from Manage Germplasm and can be included as a study list.
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