The format of the phenotype dataframe is Location (Loc), Replicate (Rep), Genotype ID (Stock) and rating (ordinal score). Gray Leaf Spot (GLS) is a disease caused by the fungus Cercospora zeae-maydis. This dataset consists of genotypic and phenotypic information for 278 maize lines from the Drought Tolerance Maize (DTMA) project of CIMMYT's Global Maize Program. The dataset includes information on disease severity measured on an ordinal scale with 5 points: 1= no disease, 2= low infection, 3=moderate infection, 4=high infection and 5=totally infected.
Montesinos-Lopez, O., A. Montesinos-Lopez, J. Crossa, J. Burgueno and K. Eskridge. 2015. "Genomic-Enabled Prediction of Ordinal Data with Bayesian Logistic Ordinal Regression". G3: Genes | Genomes | Genetics, 5, 2113-2126.